Adwaita: notebook arrow styling.

diff --git a/gtk/theme/Adwaita/_common.scss b/gtk/theme/Adwaita/_common.scss
index e522a5ca075ea91e7e4435799d14e56f3d2054d1..0c1569b1e298a403d80a1e1ea3c4c6161b04d226 100644 (file)
--- a/gtk/theme/Adwaita/_common.scss
+++ b/gtk/theme/Adwaita/_common.scss
@@ -393,6 +393,7 @@ $_dot_color: if($variant=='light', $selected_bg_color,
   }
 }
 
+%button,
 button {
 
   $_button_transition: all 200ms $ease-out-quad;
@@ -1831,8 +1832,36 @@ notebook {
       }
     }
 
-    arrow:disabled {
-      color: $insensitive_fg_color;
+    > tabs > arrow {
+      @extend %button;
+      @extend button.flat;
+
+      min-height: 16px;
+      min-width: 16px;
+      margin-left: -5px;
+      margin-right: -5px;
+      padding-left: 4px;
+      padding-right: 4px;
+      border-top-style: none;
+      border-radius: 0;
+
+      &:hover:not(:active):not(:backdrop) {
+        background-image: none;
+        background-color: transparentize(white, 0.7);
+        border-left-color: transparent;
+        border-right-color: transparent;
+        box-shadow: none;
+      }
+
+      &:disabled {
+        background-image: none;
+        background-color: transparent;
+        border-color: transparent;
+      }
+
+      &.down { -gtk-icon-source: -gtk-icontheme('pan-start-symbolic'); }
+
+      &.up { -gtk-icon-source: -gtk-icontheme('pan-end-symbolic'); }
     }
 
     tab {

diff --git a/gtk/theme/Adwaita/gtk-contained-dark.css b/gtk/theme/Adwaita/gtk-contained-dark.css
index 1f6b4a2d3b16b340f33fbd89679bcfc7753ddd13..5281c3b73cd6a0120d789637d2760e1393ea94de 100644 (file)
--- a/gtk/theme/Adwaita/gtk-contained-dark.css
+++ b/gtk/theme/Adwaita/gtk-contained-dark.css
@@ -346,7 +346,9 @@ entry, spinbutton:not(.vertical) {
     background-image: -gtk-gradient(radial, center center, 0, center center, 0.01, to(#3583d5), to(transparent)); }
   to {
     background-image: -gtk-gradient(radial, center center, 0, center center, 0.5, to(#215d9c), to(transparent)); } }
-button, headerbar button.titlebutton,
+notebook > header > tabs > arrow,
+button,
+headerbar button.titlebutton,
 .titlebar button.titlebutton {
   min-height: 24px;
   min-width: 16px;
@@ -361,7 +363,11 @@ button, headerbar button.titlebutton,
   text-shadow: 0 -1px rgba(0, 0, 0, 0.81176);
   -gtk-icon-shadow: 0 -1px rgba(0, 0, 0, 0.81176);
   box-shadow: inset 0 1px rgba(255, 255, 255, 0.05), 0 1px rgba(238, 238, 236, 0); }
-  button.flat, button.sidebar-button, headerbar button.titlebutton,
+  notebook > header > tabs > arrow.flat,
+  button.flat,
+  notebook > header > tabs > arrow,
+  button.sidebar-button,
+  headerbar button.titlebutton,
   .titlebar button.titlebutton {
     border-color: transparent;
     background-color: transparent;
@@ -370,14 +376,24 @@ button, headerbar button.titlebutton,
     text-shadow: none;
     -gtk-icon-shadow: none;
     transition: none; }
-    button.flat:hover, button.sidebar-button:hover, headerbar button.titlebutton:hover,
+    notebook > header > tabs > arrow.flat:hover,
+    button.flat:hover,
+    notebook > header > tabs > arrow:hover,
+    button.sidebar-button:hover,
+    headerbar button.titlebutton:hover,
     .titlebar button.titlebutton:hover {
       transition: all 200ms cubic-bezier(0.25, 0.46, 0.45, 0.94);
       transition-duration: 500ms; }
-      button.flat:hover:active, button.sidebar-button:hover:active, headerbar button.titlebutton:hover:active,
+      notebook > header > tabs > arrow.flat:hover:active,
+      button.flat:hover:active,
+      notebook > header > tabs > arrow:hover:active,
+      button.sidebar-button:hover:active,
+      headerbar button.titlebutton:hover:active,
       .titlebar button.titlebutton:hover:active {
         transition: all 200ms cubic-bezier(0.25, 0.46, 0.45, 0.94); }
-  button:hover, headerbar button.titlebutton:hover,
+  notebook > header > tabs > arrow:hover,
+  button:hover,
+  headerbar button.titlebutton:hover,
   .titlebar button.titlebutton:hover {
     color: #eeeeec;
     outline-color: rgba(238, 238, 236, 0.3);
@@ -393,8 +409,12 @@ button, headerbar button.titlebutton,
     -gtk-icon-shadow: 0 -1px rgba(0, 0, 0, 0.76376);
     box-shadow: inset 0 1px rgba(255, 255, 255, 0.05), 0 1px rgba(238, 238, 236, 0);
     -gtk-icon-effect: highlight; }
-  button:active, headerbar button.titlebutton:active,
-  .titlebar button.titlebutton:active, button:checked, headerbar button.titlebutton:checked,
+  notebook > header > tabs > arrow:active, notebook > header > tabs > arrow:checked,
+  button:active,
+  headerbar button.titlebutton:active,
+  .titlebar button.titlebutton:active,
+  button:checked,
+  headerbar button.titlebutton:checked,
   .titlebar button.titlebutton:checked {
     color: #eeeeec;
     outline-color: rgba(238, 238, 236, 0.3);
@@ -404,8 +424,14 @@ button, headerbar button.titlebutton,
     -gtk-icon-shadow: 0 -1px rgba(0, 0, 0, 0.89176);
     box-shadow: inset 0 2px 1px -2px rgba(0, 0, 0, 0.6), 0 1px rgba(238, 238, 236, 0);
     transition-duration: 50ms; }
-  button:backdrop, headerbar button.titlebutton:backdrop,
-  .titlebar button.titlebutton:backdrop, button.flat:backdrop, button.sidebar-button:backdrop, headerbar button.titlebutton:backdrop,
+  notebook > header > tabs > arrow:backdrop, notebook > header > tabs > arrow.flat:backdrop,
+  button:backdrop,
+  headerbar button.titlebutton:backdrop,
+  .titlebar button.titlebutton:backdrop,
+  button.flat:backdrop,
+  notebook > header > tabs > arrow:backdrop,
+  button.sidebar-button:backdrop,
+  headerbar button.titlebutton:backdrop,
   .titlebar button.titlebutton:backdrop {
     color: #949796;
     border-color: #1f2222;
@@ -414,14 +440,29 @@ button, headerbar button.titlebutton,
     -gtk-icon-shadow: none;
     box-shadow: inset 0 1px rgba(255, 255, 255, 0), 0 1px rgba(238, 238, 236, 0);
     -gtk-icon-effect: none; }
-    button:backdrop:active, button:backdrop:checked, button.flat:backdrop:active, button.sidebar-button:backdrop:active, headerbar button.titlebutton:backdrop:active,
-    .titlebar button.titlebutton:backdrop:active, button.flat:backdrop:checked, button.sidebar-button:backdrop:checked, headerbar button.titlebutton:backdrop:checked,
+    notebook > header > tabs > arrow:backdrop:active, notebook > header > tabs > arrow:backdrop:checked, notebook > header > tabs > arrow.flat:backdrop:active, notebook > header > tabs > arrow.flat:backdrop:checked,
+    button:backdrop:active,
+    button:backdrop:checked,
+    button.flat:backdrop:active,
+    notebook > header > tabs > arrow:backdrop:active,
+    button.sidebar-button:backdrop:active,
+    headerbar button.titlebutton:backdrop:active,
+    .titlebar button.titlebutton:backdrop:active,
+    button.flat:backdrop:checked,
+    notebook > header > tabs > arrow:backdrop:checked,
+    button.sidebar-button:backdrop:checked,
+    headerbar button.titlebutton:backdrop:checked,
     .titlebar button.titlebutton:backdrop:checked {
       color: #949796;
       border-color: #1f2222;
       background-image: linear-gradient(to bottom, #303535);
       box-shadow: inset 0 1px rgba(255, 255, 255, 0), 0 1px rgba(238, 238, 236, 0); }
-    button:backdrop:disabled, button.flat:backdrop:disabled, button.sidebar-button:backdrop:disabled, headerbar button.titlebutton:backdrop:disabled,
+    notebook > header > tabs > arrow:backdrop:disabled, notebook > header > tabs > arrow.flat:backdrop:disabled,
+    button:backdrop:disabled,
+    button.flat:backdrop:disabled,
+    notebook > header > tabs > arrow:backdrop:disabled,
+    button.sidebar-button:backdrop:disabled,
+    headerbar button.titlebutton:backdrop:disabled,
     .titlebar button.titlebutton:backdrop:disabled {
       color: #5d6767;
       border-color: #1f2222;
@@ -429,16 +470,38 @@ button, headerbar button.titlebutton,
       text-shadow: none;
       -gtk-icon-shadow: none;
       box-shadow: inset 0 1px rgba(255, 255, 255, 0), 0 1px rgba(238, 238, 236, 0); }
-    button:backdrop:disabled:active, button:backdrop:disabled:checked, button.flat:backdrop:disabled:active, button.sidebar-button:backdrop:disabled:active, headerbar button.titlebutton:backdrop:disabled:active,
-    .titlebar button.titlebutton:backdrop:disabled:active, button.flat:backdrop:disabled:checked, button.sidebar-button:backdrop:disabled:checked, headerbar button.titlebutton:backdrop:disabled:checked,
+    notebook > header > tabs > arrow:backdrop:disabled:active, notebook > header > tabs > arrow:backdrop:disabled:checked, notebook > header > tabs > arrow.flat:backdrop:disabled:active, notebook > header > tabs > arrow.flat:backdrop:disabled:checked,
+    button:backdrop:disabled:active,
+    button:backdrop:disabled:checked,
+    button.flat:backdrop:disabled:active,
+    notebook > header > tabs > arrow:backdrop:disabled:active,
+    button.sidebar-button:backdrop:disabled:active,
+    headerbar button.titlebutton:backdrop:disabled:active,
+    .titlebar button.titlebutton:backdrop:disabled:active,
+    button.flat:backdrop:disabled:checked,
+    notebook > header > tabs > arrow:backdrop:disabled:checked,
+    button.sidebar-button:backdrop:disabled:checked,
+    headerbar button.titlebutton:backdrop:disabled:checked,
     .titlebar button.titlebutton:backdrop:disabled:checked {
       color: #5d6767;
       border-color: #1f2222;
       background-image: linear-gradient(to bottom, #272929);
       box-shadow: inset 0 1px rgba(255, 255, 255, 0), 0 1px rgba(238, 238, 236, 0); }
-  button.flat:backdrop, button.sidebar-button:backdrop, headerbar button.titlebutton:backdrop,
-  .titlebar button.titlebutton:backdrop, button.flat:disabled, button.sidebar-button:disabled, headerbar button.titlebutton:disabled,
-  .titlebar button.titlebutton:disabled, button.flat:backdrop:disabled, button.sidebar-button:backdrop:disabled, headerbar button.titlebutton:backdrop:disabled,
+  notebook > header > tabs > arrow.flat:backdrop, notebook > header > tabs > arrow.flat:disabled, notebook > header > tabs > arrow.flat:backdrop:disabled,
+  button.flat:backdrop,
+  notebook > header > tabs > arrow:backdrop,
+  button.sidebar-button:backdrop,
+  headerbar button.titlebutton:backdrop,
+  .titlebar button.titlebutton:backdrop,
+  button.flat:disabled,
+  notebook > header > tabs > arrow:disabled,
+  button.sidebar-button:disabled,
+  headerbar button.titlebutton:disabled,
+  .titlebar button.titlebutton:disabled,
+  button.flat:backdrop:disabled,
+  notebook > header > tabs > arrow:backdrop:disabled,
+  button.sidebar-button:backdrop:disabled,
+  headerbar button.titlebutton:backdrop:disabled,
   .titlebar button.titlebutton:backdrop:disabled {
     border-color: transparent;
     background-color: transparent;
@@ -446,7 +509,9 @@ button, headerbar button.titlebutton,
     box-shadow: inset 0 1px rgba(255, 255, 255, 0), 0 1px rgba(238, 238, 236, 0);
     text-shadow: none;
     -gtk-icon-shadow: none; }
-  button:disabled, headerbar button.titlebutton:disabled,
+  notebook > header > tabs > arrow:disabled,
+  button:disabled,
+  headerbar button.titlebutton:disabled,
   .titlebar button.titlebutton:disabled {
     color: #949796;
     border-color: #1c1f1f;
@@ -454,12 +519,16 @@ button, headerbar button.titlebutton,
     text-shadow: none;
     -gtk-icon-shadow: none;
     box-shadow: inset 0 1px rgba(255, 255, 255, 0), 0 1px rgba(238, 238, 236, 0); }
-    button:disabled:active, button:disabled:checked {
+    notebook > header > tabs > arrow:disabled:active, notebook > header > tabs > arrow:disabled:checked,
+    button:disabled:active,
+    button:disabled:checked {
       color: #949796;
       border-color: #1c1f1f;
       background-image: linear-gradient(to bottom, #313434, #333636);
       box-shadow: inset 0 1px rgba(255, 255, 255, 0), 0 1px rgba(238, 238, 236, 0); }
-  button.osd, headerbar button.osd.titlebutton,
+  notebook > header > tabs > arrow.osd,
+  button.osd,
+  headerbar button.osd.titlebutton,
   .titlebar button.osd.titlebutton {
     color: #eeeeec;
     border-radius: 5px;
@@ -474,9 +543,11 @@ button, headerbar button.titlebutton,
     outline-color: rgba(238, 238, 236, 0.3);
     border: none;
     box-shadow: none; }
+    notebook > header > tabs > arrow.osd.image-button,
     button.osd.image-button {
       min-height: 48px;
       min-width: 48px; }
+    notebook > header > tabs > arrow.osd:hover,
     button.osd:hover {
       color: white;
       border-color: rgba(0, 0, 0, 0.7);
@@ -488,7 +559,9 @@ button, headerbar button.titlebutton,
       outline-color: rgba(238, 238, 236, 0.3);
       border: none;
       box-shadow: none; }
-    button.osd:active, button.osd:checked {
+    notebook > header > tabs > arrow.osd:active, notebook > header > tabs > arrow.osd:checked,
+    button.osd:active,
+    button.osd:checked {
       color: white;
       border-color: rgba(0, 0, 0, 0.7);
       background-image: linear-gradient(to bottom, rgba(0, 0, 0, 0.7));
@@ -499,7 +572,9 @@ button, headerbar button.titlebutton,
       outline-color: rgba(238, 238, 236, 0.3);
       border: none;
       box-shadow: none; }
-    button.osd:disabled, button.osd:backdrop:disabled {
+    notebook > header > tabs > arrow.osd:disabled, notebook > header > tabs > arrow.osd:backdrop:disabled,
+    button.osd:disabled,
+    button.osd:backdrop:disabled {
       color: #878a89;
       border-color: rgba(0, 0, 0, 0.7);
       background-image: linear-gradient(to bottom, rgba(53, 57, 58, 0.5));
@@ -508,6 +583,7 @@ button, headerbar button.titlebutton,
       text-shadow: none;
       -gtk-icon-shadow: none;
       border: none; }
+    notebook > header > tabs > arrow.osd:backdrop,
     button.osd:backdrop {
       color: #eeeeec;
       border-color: rgba(0, 0, 0, 0.7);
@@ -520,7 +596,8 @@ button, headerbar button.titlebutton,
   popover.background.touch-selection button, popover.background.magnifier button, .csd popover.background.touch-selection button, .csd popover.background.magnifier button, .app-notification button, .app-notification headerbar button.titlebutton, headerbar .app-notification button.titlebutton,
   .app-notification .titlebar button.titlebutton,
   .titlebar .app-notification button.titlebutton,
-  .app-notification.frame button, .osd button, .osd headerbar button.titlebutton, headerbar .osd button.titlebutton,
+  .app-notification.frame button, .osd notebook > header > tabs > arrow, .osd
+  button, .osd headerbar button.titlebutton, headerbar .osd button.titlebutton,
   .osd .titlebar button.titlebutton,
   .titlebar .osd button.titlebutton {
     color: #eeeeec;
@@ -531,7 +608,8 @@ button, headerbar button.titlebutton,
     text-shadow: 0 1px black;
     -gtk-icon-shadow: 0 1px black;
     outline-color: rgba(238, 238, 236, 0.3); }
-    popover.background.touch-selection button:hover, popover.background.magnifier button:hover, .app-notification button:hover, .osd button:hover {
+    popover.background.touch-selection button:hover, popover.background.magnifier button:hover, .app-notification button:hover, .osd notebook > header > tabs > arrow:hover, .osd
+    button:hover {
       color: white;
       border-color: rgba(0, 0, 0, 0.7);
       background-image: linear-gradient(to bottom, rgba(60, 69, 71, 0.8));
@@ -540,7 +618,11 @@ button, headerbar button.titlebutton,
       text-shadow: 0 1px black;
       -gtk-icon-shadow: 0 1px black;
       outline-color: rgba(238, 238, 236, 0.3); }
-    popover.background.touch-selection button:active, popover.background.magnifier button:active, .app-notification button:active, popover.background.touch-selection button:checked, popover.background.magnifier button:checked, .app-notification button:checked, popover.background.touch-selection button:backdrop:active, popover.background.magnifier button:backdrop:active, .app-notification button:backdrop:active, popover.background.touch-selection button:backdrop:checked, popover.background.magnifier button:backdrop:checked, .app-notification button:backdrop:checked, .osd button:active, .osd button:checked, .osd button:backdrop:active, .osd button:backdrop:checked {
+    popover.background.touch-selection button:active, popover.background.magnifier button:active, .app-notification button:active, popover.background.touch-selection button:checked, popover.background.magnifier button:checked, .app-notification button:checked, popover.background.touch-selection button:backdrop:active, popover.background.magnifier button:backdrop:active, .app-notification button:backdrop:active, popover.background.touch-selection button:backdrop:checked, popover.background.magnifier button:backdrop:checked, .app-notification button:backdrop:checked, .osd notebook > header > tabs > arrow:active, .osd notebook > header > tabs > arrow:checked, .osd notebook > header > tabs > arrow:backdrop:active, .osd notebook > header > tabs > arrow:backdrop:checked, .osd
+    button:active, .osd
+    button:checked, .osd
+    button:backdrop:active, .osd
+    button:backdrop:checked {
       color: white;
       border-color: rgba(0, 0, 0, 0.7);
       background-image: linear-gradient(to bottom, rgba(0, 0, 0, 0.7));
@@ -549,7 +631,9 @@ button, headerbar button.titlebutton,
       text-shadow: none;
       -gtk-icon-shadow: none;
       outline-color: rgba(238, 238, 236, 0.3); }
-    popover.background.touch-selection button:disabled, popover.background.magnifier button:disabled, .app-notification button:disabled, popover.background.touch-selection button:backdrop:disabled, popover.background.magnifier button:backdrop:disabled, .app-notification button:backdrop:disabled, .osd button:disabled, .osd button:backdrop:disabled {
+    popover.background.touch-selection button:disabled, popover.background.magnifier button:disabled, .app-notification button:disabled, popover.background.touch-selection button:backdrop:disabled, popover.background.magnifier button:backdrop:disabled, .app-notification button:backdrop:disabled, .osd notebook > header > tabs > arrow:disabled, .osd notebook > header > tabs > arrow:backdrop:disabled, .osd
+    button:disabled, .osd
+    button:backdrop:disabled {
       color: #878a89;
       border-color: rgba(0, 0, 0, 0.7);
       background-image: linear-gradient(to bottom, rgba(53, 57, 58, 0.5));
@@ -557,7 +641,8 @@ button, headerbar button.titlebutton,
       box-shadow: none;
       text-shadow: none;
       -gtk-icon-shadow: none; }
-    popover.background.touch-selection button:backdrop, popover.background.magnifier button:backdrop, .app-notification button:backdrop, .osd button:backdrop {
+    popover.background.touch-selection button:backdrop, popover.background.magnifier button:backdrop, .app-notification button:backdrop, .osd notebook > header > tabs > arrow:backdrop, .osd
+    button:backdrop {
       color: #eeeeec;
       border-color: rgba(0, 0, 0, 0.7);
       background-image: linear-gradient(to bottom, rgba(32, 37, 38, 0.8));
@@ -565,13 +650,16 @@ button, headerbar button.titlebutton,
       box-shadow: none;
       text-shadow: none;
       -gtk-icon-shadow: none; }
-    popover.background.touch-selection button.flat, popover.background.touch-selection button.sidebar-button, popover.background.touch-selection headerbar button.titlebutton, headerbar popover.background.touch-selection button.titlebutton,
+    popover.background.touch-selection button.flat, popover.background.touch-selection notebook > header > tabs > arrow, popover.background.touch-selection button.sidebar-button, popover.background.touch-selection headerbar button.titlebutton, headerbar popover.background.touch-selection button.titlebutton,
     popover.background.touch-selection .titlebar button.titlebutton,
-    .titlebar popover.background.touch-selection button.titlebutton, popover.background.magnifier button.flat, popover.background.magnifier button.sidebar-button, popover.background.magnifier headerbar button.titlebutton, headerbar popover.background.magnifier button.titlebutton,
+    .titlebar popover.background.touch-selection button.titlebutton, popover.background.magnifier button.flat, popover.background.magnifier notebook > header > tabs > arrow, popover.background.magnifier button.sidebar-button, popover.background.magnifier headerbar button.titlebutton, headerbar popover.background.magnifier button.titlebutton,
     popover.background.magnifier .titlebar button.titlebutton,
-    .titlebar popover.background.magnifier button.titlebutton, .app-notification button.flat, .app-notification button.sidebar-button, .app-notification headerbar button.titlebutton, headerbar .app-notification button.titlebutton,
+    .titlebar popover.background.magnifier button.titlebutton, .csd popover.background.touch-selection notebook > header > tabs > arrow, .csd popover.background.magnifier notebook > header > tabs > arrow, .app-notification button.flat, .app-notification notebook > header > tabs > arrow, .app-notification button.sidebar-button, .app-notification headerbar button.titlebutton, headerbar .app-notification button.titlebutton,
     .app-notification .titlebar button.titlebutton,
-    .titlebar .app-notification button.titlebutton, .osd button.flat, .osd button.sidebar-button, .osd headerbar button.titlebutton, headerbar .osd button.titlebutton,
+    .titlebar .app-notification button.titlebutton,
+    .app-notification.frame notebook > header > tabs > arrow, .osd notebook > header > tabs > arrow.flat, .osd
+    button.flat, .osd notebook > header > tabs > arrow, .osd
+    button.sidebar-button, .osd headerbar button.titlebutton, headerbar .osd button.titlebutton,
     .osd .titlebar button.titlebutton,
     .titlebar .osd button.titlebutton {
       border-color: transparent;
@@ -583,13 +671,15 @@ button, headerbar button.titlebutton,
       box-shadow: none;
       text-shadow: 0 1px black;
       -gtk-icon-shadow: 0 1px black; }
-      popover.background.touch-selection button.flat:hover, popover.background.touch-selection button.sidebar-button:hover, popover.background.touch-selection headerbar button.titlebutton:hover, headerbar popover.background.touch-selection button.titlebutton:hover,
+      popover.background.touch-selection button.flat:hover, popover.background.touch-selection notebook > header > tabs > arrow:hover, popover.background.touch-selection button.sidebar-button:hover, popover.background.touch-selection headerbar button.titlebutton:hover, headerbar popover.background.touch-selection button.titlebutton:hover,
       popover.background.touch-selection .titlebar button.titlebutton:hover,
-      .titlebar popover.background.touch-selection button.titlebutton:hover, popover.background.magnifier button.flat:hover, popover.background.magnifier button.sidebar-button:hover, popover.background.magnifier headerbar button.titlebutton:hover, headerbar popover.background.magnifier button.titlebutton:hover,
+      .titlebar popover.background.touch-selection button.titlebutton:hover, popover.background.magnifier button.flat:hover, popover.background.magnifier notebook > header > tabs > arrow:hover, popover.background.magnifier button.sidebar-button:hover, popover.background.magnifier headerbar button.titlebutton:hover, headerbar popover.background.magnifier button.titlebutton:hover,
       popover.background.magnifier .titlebar button.titlebutton:hover,
-      .titlebar popover.background.magnifier button.titlebutton:hover, .app-notification button.flat:hover, .app-notification button.sidebar-button:hover, .app-notification headerbar button.titlebutton:hover, headerbar .app-notification button.titlebutton:hover,
+      .titlebar popover.background.magnifier button.titlebutton:hover, .app-notification button.flat:hover, .app-notification notebook > header > tabs > arrow:hover, .app-notification button.sidebar-button:hover, .app-notification headerbar button.titlebutton:hover, headerbar .app-notification button.titlebutton:hover,
       .app-notification .titlebar button.titlebutton:hover,
-      .titlebar .app-notification button.titlebutton:hover, .osd button.flat:hover, .osd button.sidebar-button:hover, .osd headerbar button.titlebutton:hover, headerbar .osd button.titlebutton:hover,
+      .titlebar .app-notification button.titlebutton:hover, .osd notebook > header > tabs > arrow.flat:hover, .osd
+      button.flat:hover, .osd notebook > header > tabs > arrow:hover, .osd
+      button.sidebar-button:hover, .osd headerbar button.titlebutton:hover, headerbar .osd button.titlebutton:hover,
       .osd .titlebar button.titlebutton:hover,
       .titlebar .osd button.titlebutton:hover {
         color: white;
@@ -600,13 +690,15 @@ button, headerbar button.titlebutton,
         text-shadow: 0 1px black;
         -gtk-icon-shadow: 0 1px black;
         outline-color: rgba(238, 238, 236, 0.3); }
-      popover.background.touch-selection button.flat:disabled, popover.background.touch-selection button.sidebar-button:disabled, popover.background.touch-selection headerbar button.titlebutton:disabled, headerbar popover.background.touch-selection button.titlebutton:disabled,
+      popover.background.touch-selection button.flat:disabled, popover.background.touch-selection notebook > header > tabs > arrow:disabled, popover.background.touch-selection button.sidebar-button:disabled, popover.background.touch-selection headerbar button.titlebutton:disabled, headerbar popover.background.touch-selection button.titlebutton:disabled,
       popover.background.touch-selection .titlebar button.titlebutton:disabled,
-      .titlebar popover.background.touch-selection button.titlebutton:disabled, popover.background.magnifier button.flat:disabled, popover.background.magnifier button.sidebar-button:disabled, popover.background.magnifier headerbar button.titlebutton:disabled, headerbar popover.background.magnifier button.titlebutton:disabled,
+      .titlebar popover.background.touch-selection button.titlebutton:disabled, popover.background.magnifier button.flat:disabled, popover.background.magnifier notebook > header > tabs > arrow:disabled, popover.background.magnifier button.sidebar-button:disabled, popover.background.magnifier headerbar button.titlebutton:disabled, headerbar popover.background.magnifier button.titlebutton:disabled,
       popover.background.magnifier .titlebar button.titlebutton:disabled,
-      .titlebar popover.background.magnifier button.titlebutton:disabled, .app-notification button.flat:disabled, .app-notification button.sidebar-button:disabled, .app-notification headerbar button.titlebutton:disabled, headerbar .app-notification button.titlebutton:disabled,
+      .titlebar popover.background.magnifier button.titlebutton:disabled, .app-notification button.flat:disabled, .app-notification notebook > header > tabs > arrow:disabled, .app-notification button.sidebar-button:disabled, .app-notification headerbar button.titlebutton:disabled, headerbar .app-notification button.titlebutton:disabled,
       .app-notification .titlebar button.titlebutton:disabled,
-      .titlebar .app-notification button.titlebutton:disabled, .osd button.flat:disabled, .osd button.sidebar-button:disabled, .osd headerbar button.titlebutton:disabled, headerbar .osd button.titlebutton:disabled,
+      .titlebar .app-notification button.titlebutton:disabled, .osd notebook > header > tabs > arrow.flat:disabled, .osd
+      button.flat:disabled, .osd notebook > header > tabs > arrow:disabled, .osd
+      button.sidebar-button:disabled, .osd headerbar button.titlebutton:disabled, headerbar .osd button.titlebutton:disabled,
       .osd .titlebar button.titlebutton:disabled,
       .titlebar .osd button.titlebutton:disabled {
         color: #878a89;
@@ -619,13 +711,15 @@ button, headerbar button.titlebutton,
         background-image: none;
         border-color: transparent;
         box-shadow: none; }
-      popover.background.touch-selection button.flat:backdrop, popover.background.touch-selection button.sidebar-button:backdrop, popover.background.touch-selection headerbar button.titlebutton:backdrop, headerbar popover.background.touch-selection button.titlebutton:backdrop,
+      popover.background.touch-selection button.flat:backdrop, popover.background.touch-selection notebook > header > tabs > arrow:backdrop, popover.background.touch-selection button.sidebar-button:backdrop, popover.background.touch-selection headerbar button.titlebutton:backdrop, headerbar popover.background.touch-selection button.titlebutton:backdrop,
       popover.background.touch-selection .titlebar button.titlebutton:backdrop,
-      .titlebar popover.background.touch-selection button.titlebutton:backdrop, popover.background.magnifier button.flat:backdrop, popover.background.magnifier button.sidebar-button:backdrop, popover.background.magnifier headerbar button.titlebutton:backdrop, headerbar popover.background.magnifier button.titlebutton:backdrop,
+      .titlebar popover.background.touch-selection button.titlebutton:backdrop, popover.background.magnifier button.flat:backdrop, popover.background.magnifier notebook > header > tabs > arrow:backdrop, popover.background.magnifier button.sidebar-button:backdrop, popover.background.magnifier headerbar button.titlebutton:backdrop, headerbar popover.background.magnifier button.titlebutton:backdrop,
       popover.background.magnifier .titlebar button.titlebutton:backdrop,
-      .titlebar popover.background.magnifier button.titlebutton:backdrop, .app-notification button.flat:backdrop, .app-notification button.sidebar-button:backdrop, .app-notification headerbar button.titlebutton:backdrop, headerbar .app-notification button.titlebutton:backdrop,
+      .titlebar popover.background.magnifier button.titlebutton:backdrop, .app-notification button.flat:backdrop, .app-notification notebook > header > tabs > arrow:backdrop, .app-notification button.sidebar-button:backdrop, .app-notification headerbar button.titlebutton:backdrop, headerbar .app-notification button.titlebutton:backdrop,
       .app-notification .titlebar button.titlebutton:backdrop,
-      .titlebar .app-notification button.titlebutton:backdrop, .osd button.flat:backdrop, .osd button.sidebar-button:backdrop, .osd headerbar button.titlebutton:backdrop, headerbar .osd button.titlebutton:backdrop,
+      .titlebar .app-notification button.titlebutton:backdrop, .osd notebook > header > tabs > arrow.flat:backdrop, .osd
+      button.flat:backdrop, .osd notebook > header > tabs > arrow:backdrop, .osd
+      button.sidebar-button:backdrop, .osd headerbar button.titlebutton:backdrop, headerbar .osd button.titlebutton:backdrop,
       .osd .titlebar button.titlebutton:backdrop,
       .titlebar .osd button.titlebutton:backdrop {
         border-color: transparent;
@@ -634,21 +728,25 @@ button, headerbar button.titlebutton,
         box-shadow: inset 0 1px rgba(255, 255, 255, 0), 0 1px rgba(238, 238, 236, 0);
         text-shadow: none;
         -gtk-icon-shadow: none; }
-      popover.background.touch-selection button.flat:active, popover.background.touch-selection button.sidebar-button:active, popover.background.touch-selection headerbar button.titlebutton:active, headerbar popover.background.touch-selection button.titlebutton:active,
+      popover.background.touch-selection button.flat:active, popover.background.touch-selection notebook > header > tabs > arrow:active, popover.background.touch-selection button.sidebar-button:active, popover.background.touch-selection headerbar button.titlebutton:active, headerbar popover.background.touch-selection button.titlebutton:active,
       popover.background.touch-selection .titlebar button.titlebutton:active,
-      .titlebar popover.background.touch-selection button.titlebutton:active, popover.background.magnifier button.flat:active, popover.background.magnifier button.sidebar-button:active, popover.background.magnifier headerbar button.titlebutton:active, headerbar popover.background.magnifier button.titlebutton:active,
+      .titlebar popover.background.touch-selection button.titlebutton:active, popover.background.magnifier button.flat:active, popover.background.magnifier notebook > header > tabs > arrow:active, popover.background.magnifier button.sidebar-button:active, popover.background.magnifier headerbar button.titlebutton:active, headerbar popover.background.magnifier button.titlebutton:active,
       popover.background.magnifier .titlebar button.titlebutton:active,
-      .titlebar popover.background.magnifier button.titlebutton:active, .app-notification button.flat:active, .app-notification button.sidebar-button:active, .app-notification headerbar button.titlebutton:active, headerbar .app-notification button.titlebutton:active,
+      .titlebar popover.background.magnifier button.titlebutton:active, .app-notification button.flat:active, .app-notification notebook > header > tabs > arrow:active, .app-notification button.sidebar-button:active, .app-notification headerbar button.titlebutton:active, headerbar .app-notification button.titlebutton:active,
       .app-notification .titlebar button.titlebutton:active,
-      .titlebar .app-notification button.titlebutton:active, popover.background.touch-selection button.flat:checked, popover.background.touch-selection button.sidebar-button:checked, popover.background.touch-selection headerbar button.titlebutton:checked, headerbar popover.background.touch-selection button.titlebutton:checked,
+      .titlebar .app-notification button.titlebutton:active, popover.background.touch-selection button.flat:checked, popover.background.touch-selection notebook > header > tabs > arrow:checked, popover.background.touch-selection button.sidebar-button:checked, popover.background.touch-selection headerbar button.titlebutton:checked, headerbar popover.background.touch-selection button.titlebutton:checked,
       popover.background.touch-selection .titlebar button.titlebutton:checked,
-      .titlebar popover.background.touch-selection button.titlebutton:checked, popover.background.magnifier button.flat:checked, popover.background.magnifier button.sidebar-button:checked, popover.background.magnifier headerbar button.titlebutton:checked, headerbar popover.background.magnifier button.titlebutton:checked,
+      .titlebar popover.background.touch-selection button.titlebutton:checked, popover.background.magnifier button.flat:checked, popover.background.magnifier notebook > header > tabs > arrow:checked, popover.background.magnifier button.sidebar-button:checked, popover.background.magnifier headerbar button.titlebutton:checked, headerbar popover.background.magnifier button.titlebutton:checked,
       popover.background.magnifier .titlebar button.titlebutton:checked,
-      .titlebar popover.background.magnifier button.titlebutton:checked, .app-notification button.flat:checked, .app-notification button.sidebar-button:checked, .app-notification headerbar button.titlebutton:checked, headerbar .app-notification button.titlebutton:checked,
+      .titlebar popover.background.magnifier button.titlebutton:checked, .app-notification button.flat:checked, .app-notification notebook > header > tabs > arrow:checked, .app-notification button.sidebar-button:checked, .app-notification headerbar button.titlebutton:checked, headerbar .app-notification button.titlebutton:checked,
       .app-notification .titlebar button.titlebutton:checked,
-      .titlebar .app-notification button.titlebutton:checked, .osd button.flat:active, .osd button.sidebar-button:active, .osd headerbar button.titlebutton:active, headerbar .osd button.titlebutton:active,
+      .titlebar .app-notification button.titlebutton:checked, .osd notebook > header > tabs > arrow.flat:active, .osd notebook > header > tabs > arrow.flat:checked, .osd
+      button.flat:active, .osd notebook > header > tabs > arrow:active, .osd
+      button.sidebar-button:active, .osd headerbar button.titlebutton:active, headerbar .osd button.titlebutton:active,
       .osd .titlebar button.titlebutton:active,
-      .titlebar .osd button.titlebutton:active, .osd button.flat:checked, .osd button.sidebar-button:checked, .osd headerbar button.titlebutton:checked, headerbar .osd button.titlebutton:checked,
+      .titlebar .osd button.titlebutton:active, .osd
+      button.flat:checked, .osd notebook > header > tabs > arrow:checked, .osd
+      button.sidebar-button:checked, .osd headerbar button.titlebutton:checked, headerbar .osd button.titlebutton:checked,
       .osd .titlebar button.titlebutton:checked,
       .titlebar .osd button.titlebutton:checked {
         color: white;
@@ -659,7 +757,9 @@ button, headerbar button.titlebutton,
         text-shadow: none;
         -gtk-icon-shadow: none;
         outline-color: rgba(238, 238, 236, 0.3); }
-  button.suggested-action, headerbar button.suggested-action.titlebutton,
+  notebook > header > tabs > arrow.suggested-action,
+  button.suggested-action,
+  headerbar button.suggested-action.titlebutton,
   .titlebar button.suggested-action.titlebutton {
     color: white;
     outline-color: rgba(255, 255, 255, 0.3);
@@ -668,7 +768,11 @@ button, headerbar button.titlebutton,
     text-shadow: 0 -1px rgba(0, 0, 0, 0.70353);
     -gtk-icon-shadow: 0 -1px rgba(0, 0, 0, 0.70353);
     box-shadow: inset 0 1px rgba(255, 255, 255, 0.05), 0 1px rgba(238, 238, 236, 0); }
-    button.suggested-action.flat, button.suggested-action.sidebar-button, headerbar button.suggested-action.titlebutton,
+    notebook > header > tabs > arrow.suggested-action.flat,
+    button.suggested-action.flat,
+    notebook > header > tabs > arrow.suggested-action,
+    button.suggested-action.sidebar-button,
+    headerbar button.suggested-action.titlebutton,
     .titlebar button.suggested-action.titlebutton {
       border-color: transparent;
       background-color: transparent;
@@ -677,6 +781,7 @@ button, headerbar button.titlebutton,
       text-shadow: none;
       -gtk-icon-shadow: none;
       color: #215d9c; }
+    notebook > header > tabs > arrow.suggested-action:hover,
     button.suggested-action:hover {
       color: white;
       outline-color: rgba(255, 255, 255, 0.3);
@@ -691,7 +796,9 @@ button, headerbar button.titlebutton,
       text-shadow: 0 -1px rgba(0, 0, 0, 0.65553);
       -gtk-icon-shadow: 0 -1px rgba(0, 0, 0, 0.65553);
       box-shadow: inset 0 1px rgba(255, 255, 255, 0.05), 0 1px rgba(238, 238, 236, 0); }
-    button.suggested-action:active, button.suggested-action:checked {
+    notebook > header > tabs > arrow.suggested-action:active, notebook > header > tabs > arrow.suggested-action:checked,
+    button.suggested-action:active,
+    button.suggested-action:checked {
       color: white;
       outline-color: rgba(255, 255, 255, 0.3);
       border-color: #0b1e33;
@@ -699,7 +806,12 @@ button, headerbar button.titlebutton,
       text-shadow: 0 -1px rgba(0, 0, 0, 0.78353);
       -gtk-icon-shadow: 0 -1px rgba(0, 0, 0, 0.78353);
       box-shadow: inset 0 2px 1px -2px rgba(0, 0, 0, 0.6), 0 1px rgba(238, 238, 236, 0); }
-    button.suggested-action:backdrop, button.suggested-action.flat:backdrop, button.suggested-action.sidebar-button:backdrop, headerbar button.suggested-action.titlebutton:backdrop,
+    notebook > header > tabs > arrow.suggested-action:backdrop, notebook > header > tabs > arrow.suggested-action.flat:backdrop,
+    button.suggested-action:backdrop,
+    button.suggested-action.flat:backdrop,
+    notebook > header > tabs > arrow.suggested-action:backdrop,
+    button.suggested-action.sidebar-button:backdrop,
+    headerbar button.suggested-action.titlebutton:backdrop,
     .titlebar button.suggested-action.titlebutton:backdrop {
       color: #d3dfeb;
       border-color: #0b1e33;
@@ -707,14 +819,29 @@ button, headerbar button.titlebutton,
       text-shadow: none;
       -gtk-icon-shadow: none;
       box-shadow: inset 0 1px rgba(255, 255, 255, 0), 0 1px rgba(238, 238, 236, 0); }
-      button.suggested-action:backdrop:active, button.suggested-action:backdrop:checked, button.suggested-action.flat:backdrop:active, button.suggested-action.sidebar-button:backdrop:active, headerbar button.suggested-action.titlebutton:backdrop:active,
-      .titlebar button.suggested-action.titlebutton:backdrop:active, button.suggested-action.flat:backdrop:checked, button.suggested-action.sidebar-button:backdrop:checked, headerbar button.suggested-action.titlebutton:backdrop:checked,
+      notebook > header > tabs > arrow.suggested-action:backdrop:active, notebook > header > tabs > arrow.suggested-action:backdrop:checked, notebook > header > tabs > arrow.suggested-action.flat:backdrop:active, notebook > header > tabs > arrow.suggested-action.flat:backdrop:checked,
+      button.suggested-action:backdrop:active,
+      button.suggested-action:backdrop:checked,
+      button.suggested-action.flat:backdrop:active,
+      notebook > header > tabs > arrow.suggested-action:backdrop:active,
+      button.suggested-action.sidebar-button:backdrop:active,
+      headerbar button.suggested-action.titlebutton:backdrop:active,
+      .titlebar button.suggested-action.titlebutton:backdrop:active,
+      button.suggested-action.flat:backdrop:checked,
+      notebook > header > tabs > arrow.suggested-action:backdrop:checked,
+      button.suggested-action.sidebar-button:backdrop:checked,
+      headerbar button.suggested-action.titlebutton:backdrop:checked,
       .titlebar button.suggested-action.titlebutton:backdrop:checked {
         color: #d1dae3;
         border-color: #0b1e33;
         background-image: linear-gradient(to bottom, #184472);
         box-shadow: inset 0 1px rgba(255, 255, 255, 0), 0 1px rgba(238, 238, 236, 0); }
-      button.suggested-action:backdrop:disabled, button.suggested-action.flat:backdrop:disabled, button.suggested-action.sidebar-button:backdrop:disabled, headerbar button.suggested-action.titlebutton:backdrop:disabled,
+      notebook > header > tabs > arrow.suggested-action:backdrop:disabled, notebook > header > tabs > arrow.suggested-action.flat:backdrop:disabled,
+      button.suggested-action:backdrop:disabled,
+      button.suggested-action.flat:backdrop:disabled,
+      notebook > header > tabs > arrow.suggested-action:backdrop:disabled,
+      button.suggested-action.sidebar-button:backdrop:disabled,
+      headerbar button.suggested-action.titlebutton:backdrop:disabled,
       .titlebar button.suggested-action.titlebutton:backdrop:disabled {
         color: #5d6767;
         border-color: #1f2222;
@@ -722,16 +849,38 @@ button, headerbar button.titlebutton,
         text-shadow: none;
         -gtk-icon-shadow: none;
         box-shadow: inset 0 1px rgba(255, 255, 255, 0), 0 1px rgba(238, 238, 236, 0); }
-        button.suggested-action:backdrop:disabled:active, button.suggested-action:backdrop:disabled:checked, button.suggested-action.flat:backdrop:disabled:active, button.suggested-action.sidebar-button:backdrop:disabled:active, headerbar button.suggested-action.titlebutton:backdrop:disabled:active,
-        .titlebar button.suggested-action.titlebutton:backdrop:disabled:active, button.suggested-action.flat:backdrop:disabled:checked, button.suggested-action.sidebar-button:backdrop:disabled:checked, headerbar button.suggested-action.titlebutton:backdrop:disabled:checked,
+        notebook > header > tabs > arrow.suggested-action:backdrop:disabled:active, notebook > header > tabs > arrow.suggested-action:backdrop:disabled:checked, notebook > header > tabs > arrow.suggested-action.flat:backdrop:disabled:active, notebook > header > tabs > arrow.suggested-action.flat:backdrop:disabled:checked,
+        button.suggested-action:backdrop:disabled:active,
+        button.suggested-action:backdrop:disabled:checked,
+        button.suggested-action.flat:backdrop:disabled:active,
+        notebook > header > tabs > arrow.suggested-action:backdrop:disabled:active,
+        button.suggested-action.sidebar-button:backdrop:disabled:active,
+        headerbar button.suggested-action.titlebutton:backdrop:disabled:active,
+        .titlebar button.suggested-action.titlebutton:backdrop:disabled:active,
+        button.suggested-action.flat:backdrop:disabled:checked,
+        notebook > header > tabs > arrow.suggested-action:backdrop:disabled:checked,
+        button.suggested-action.sidebar-button:backdrop:disabled:checked,
+        headerbar button.suggested-action.titlebutton:backdrop:disabled:checked,
         .titlebar button.suggested-action.titlebutton:backdrop:disabled:checked {
           color: #6c88a7;
           border-color: #0b1e33;
           background-image: linear-gradient(to bottom, #1d4877);
           box-shadow: inset 0 1px rgba(255, 255, 255, 0), 0 1px rgba(238, 238, 236, 0); }
-    button.suggested-action.flat:backdrop, button.suggested-action.sidebar-button:backdrop, headerbar button.suggested-action.titlebutton:backdrop,
-    .titlebar button.suggested-action.titlebutton:backdrop, button.suggested-action.flat:disabled, button.suggested-action.sidebar-button:disabled, headerbar button.suggested-action.titlebutton:disabled,
-    .titlebar button.suggested-action.titlebutton:disabled, button.suggested-action.flat:backdrop:disabled, button.suggested-action.sidebar-button:backdrop:disabled, headerbar button.suggested-action.titlebutton:backdrop:disabled,
+    notebook > header > tabs > arrow.suggested-action.flat:backdrop, notebook > header > tabs > arrow.suggested-action.flat:disabled, notebook > header > tabs > arrow.suggested-action.flat:backdrop:disabled,
+    button.suggested-action.flat:backdrop,
+    notebook > header > tabs > arrow.suggested-action:backdrop,
+    button.suggested-action.sidebar-button:backdrop,
+    headerbar button.suggested-action.titlebutton:backdrop,
+    .titlebar button.suggested-action.titlebutton:backdrop,
+    button.suggested-action.flat:disabled,
+    notebook > header > tabs > arrow.suggested-action:disabled,
+    button.suggested-action.sidebar-button:disabled,
+    headerbar button.suggested-action.titlebutton:disabled,
+    .titlebar button.suggested-action.titlebutton:disabled,
+    button.suggested-action.flat:backdrop:disabled,
+    notebook > header > tabs > arrow.suggested-action:backdrop:disabled,
+    button.suggested-action.sidebar-button:backdrop:disabled,
+    headerbar button.suggested-action.titlebutton:backdrop:disabled,
     .titlebar button.suggested-action.titlebutton:backdrop:disabled {
       border-color: transparent;
       background-color: transparent;
@@ -740,6 +889,7 @@ button, headerbar button.titlebutton,
       text-shadow: none;
       -gtk-icon-shadow: none;
       color: rgba(33, 93, 156, 0.8); }
+    notebook > header > tabs > arrow.suggested-action:disabled,
     button.suggested-action:disabled {
       color: #949796;
       border-color: #1c1f1f;
@@ -747,12 +897,15 @@ button, headerbar button.titlebutton,
       text-shadow: none;
       -gtk-icon-shadow: none;
       box-shadow: inset 0 1px rgba(255, 255, 255, 0), 0 1px rgba(238, 238, 236, 0); }
-      button.suggested-action:disabled:active, button.suggested-action:disabled:checked {
+      notebook > header > tabs > arrow.suggested-action:disabled:active, notebook > header > tabs > arrow.suggested-action:disabled:checked,
+      button.suggested-action:disabled:active,
+      button.suggested-action:disabled:checked {
         color: #a5b6c9;
         border-color: #0b1e33;
         background-image: linear-gradient(to bottom, #1b4470, #1d4877);
         box-shadow: inset 0 1px rgba(255, 255, 255, 0), 0 1px rgba(238, 238, 236, 0); }
-    .osd button.suggested-action {
+    .osd notebook > header > tabs > arrow.suggested-action, .osd
+    button.suggested-action {
       color: #eeeeec;
       border-color: rgba(0, 0, 0, 0.7);
       background-image: linear-gradient(to bottom, rgba(33, 93, 156, 0.5));
@@ -761,7 +914,8 @@ button, headerbar button.titlebutton,
       text-shadow: 0 1px black;
       -gtk-icon-shadow: 0 1px black;
       outline-color: rgba(238, 238, 236, 0.3); }
-      .osd button.suggested-action:hover {
+      .osd notebook > header > tabs > arrow.suggested-action:hover, .osd
+      button.suggested-action:hover {
         color: white;
         border-color: rgba(0, 0, 0, 0.7);
         background-image: linear-gradient(to bottom, rgba(33, 93, 156, 0.7));
@@ -770,7 +924,11 @@ button, headerbar button.titlebutton,
         text-shadow: 0 1px black;
         -gtk-icon-shadow: 0 1px black;
         outline-color: rgba(238, 238, 236, 0.3); }
-      .osd button.suggested-action:active, .osd button.suggested-action:checked, .osd button.suggested-action:backdrop:active, .osd button.suggested-action:backdrop:checked {
+      .osd notebook > header > tabs > arrow.suggested-action:active, .osd notebook > header > tabs > arrow.suggested-action:checked, .osd notebook > header > tabs > arrow.suggested-action:backdrop:active, .osd notebook > header > tabs > arrow.suggested-action:backdrop:checked, .osd
+      button.suggested-action:active, .osd
+      button.suggested-action:checked, .osd
+      button.suggested-action:backdrop:active, .osd
+      button.suggested-action:backdrop:checked {
         color: white;
         border-color: rgba(0, 0, 0, 0.7);
         background-image: linear-gradient(to bottom, #215d9c);
@@ -779,7 +937,9 @@ button, headerbar button.titlebutton,
         text-shadow: none;
         -gtk-icon-shadow: none;
         outline-color: rgba(238, 238, 236, 0.3); }
-      .osd button.suggested-action:disabled, .osd button.suggested-action:backdrop:disabled {
+      .osd notebook > header > tabs > arrow.suggested-action:disabled, .osd notebook > header > tabs > arrow.suggested-action:backdrop:disabled, .osd
+      button.suggested-action:disabled, .osd
+      button.suggested-action:backdrop:disabled {
         color: #878a89;
         border-color: rgba(0, 0, 0, 0.7);
         background-image: linear-gradient(to bottom, rgba(53, 57, 58, 0.5));
@@ -787,7 +947,8 @@ button, headerbar button.titlebutton,
         box-shadow: none;
         text-shadow: none;
         -gtk-icon-shadow: none; }
-      .osd button.suggested-action:backdrop {
+      .osd notebook > header > tabs > arrow.suggested-action:backdrop, .osd
+      button.suggested-action:backdrop {
         color: #eeeeec;
         border-color: rgba(0, 0, 0, 0.7);
         background-image: linear-gradient(to bottom, rgba(33, 93, 156, 0.5));
@@ -795,7 +956,9 @@ button, headerbar button.titlebutton,
         box-shadow: none;
         text-shadow: none;
         -gtk-icon-shadow: none; }
-  button.destructive-action, headerbar button.destructive-action.titlebutton,
+  notebook > header > tabs > arrow.destructive-action,
+  button.destructive-action,
+  headerbar button.destructive-action.titlebutton,
   .titlebar button.destructive-action.titlebutton {
     color: white;
     outline-color: rgba(255, 255, 255, 0.3);
@@ -804,7 +967,11 @@ button, headerbar button.titlebutton,
     text-shadow: 0 -1px rgba(0, 0, 0, 0.64078);
     -gtk-icon-shadow: 0 -1px rgba(0, 0, 0, 0.64078);
     box-shadow: inset 0 1px rgba(255, 255, 255, 0.2), 0 1px rgba(238, 238, 236, 0); }
-    button.destructive-action.flat, button.destructive-action.sidebar-button, headerbar button.destructive-action.titlebutton,
+    notebook > header > tabs > arrow.destructive-action.flat,
+    button.destructive-action.flat,
+    notebook > header > tabs > arrow.destructive-action,
+    button.destructive-action.sidebar-button,
+    headerbar button.destructive-action.titlebutton,
     .titlebar button.destructive-action.titlebutton {
       border-color: transparent;
       background-color: transparent;
@@ -813,6 +980,7 @@ button, headerbar button.titlebutton,
       text-shadow: none;
       -gtk-icon-shadow: none;
       color: #d51010; }
+    notebook > header > tabs > arrow.destructive-action:hover,
     button.destructive-action:hover {
       color: white;
       outline-color: rgba(255, 255, 255, 0.3);
@@ -827,7 +995,9 @@ button, headerbar button.titlebutton,
       text-shadow: 0 -1px rgba(0, 0, 0, 0.59278);
       -gtk-icon-shadow: 0 -1px rgba(0, 0, 0, 0.59278);
       box-shadow: inset 0 1px rgba(255, 255, 255, 0.2), 0 1px rgba(238, 238, 236, 0); }
-    button.destructive-action:active, button.destructive-action:checked {
+    notebook > header > tabs > arrow.destructive-action:active, notebook > header > tabs > arrow.destructive-action:checked,
+    button.destructive-action:active,
+    button.destructive-action:checked {
       color: white;
       outline-color: rgba(255, 255, 255, 0.3);
       border-color: #5e0707;
@@ -835,7 +1005,12 @@ button, headerbar button.titlebutton,
       text-shadow: 0 -1px rgba(0, 0, 0, 0.72078);
       -gtk-icon-shadow: 0 -1px rgba(0, 0, 0, 0.72078);
       box-shadow: inset 0 2px 1px -2px rgba(0, 0, 0, 0.6), 0 1px rgba(238, 238, 236, 0); }
-    button.destructive-action:backdrop, button.destructive-action.flat:backdrop, button.destructive-action.sidebar-button:backdrop, headerbar button.destructive-action.titlebutton:backdrop,
+    notebook > header > tabs > arrow.destructive-action:backdrop, notebook > header > tabs > arrow.destructive-action.flat:backdrop,
+    button.destructive-action:backdrop,
+    button.destructive-action.flat:backdrop,
+    notebook > header > tabs > arrow.destructive-action:backdrop,
+    button.destructive-action.sidebar-button:backdrop,
+    headerbar button.destructive-action.titlebutton:backdrop,
     .titlebar button.destructive-action.titlebutton:backdrop {
       color: #f7cfcf;
       border-color: #5e0707;
@@ -843,14 +1018,29 @@ button, headerbar button.titlebutton,
       text-shadow: none;
       -gtk-icon-shadow: none;
       box-shadow: inset 0 1px rgba(255, 255, 255, 0), 0 1px rgba(238, 238, 236, 0); }
-      button.destructive-action:backdrop:active, button.destructive-action:backdrop:checked, button.destructive-action.flat:backdrop:active, button.destructive-action.sidebar-button:backdrop:active, headerbar button.destructive-action.titlebutton:backdrop:active,
-      .titlebar button.destructive-action.titlebutton:backdrop:active, button.destructive-action.flat:backdrop:checked, button.destructive-action.sidebar-button:backdrop:checked, headerbar button.destructive-action.titlebutton:backdrop:checked,
+      notebook > header > tabs > arrow.destructive-action:backdrop:active, notebook > header > tabs > arrow.destructive-action:backdrop:checked, notebook > header > tabs > arrow.destructive-action.flat:backdrop:active, notebook > header > tabs > arrow.destructive-action.flat:backdrop:checked,
+      button.destructive-action:backdrop:active,
+      button.destructive-action:backdrop:checked,
+      button.destructive-action.flat:backdrop:active,
+      notebook > header > tabs > arrow.destructive-action:backdrop:active,
+      button.destructive-action.sidebar-button:backdrop:active,
+      headerbar button.destructive-action.titlebutton:backdrop:active,
+      .titlebar button.destructive-action.titlebutton:backdrop:active,
+      button.destructive-action.flat:backdrop:checked,
+      notebook > header > tabs > arrow.destructive-action:backdrop:checked,
+      button.destructive-action.sidebar-button:backdrop:checked,
+      headerbar button.destructive-action.titlebutton:backdrop:checked,
       .titlebar button.destructive-action.titlebutton:backdrop:checked {
         color: #edcece;
         border-color: #5e0707;
         background-image: linear-gradient(to bottom, #a60c0c);
         box-shadow: inset 0 1px rgba(255, 255, 255, 0), 0 1px rgba(238, 238, 236, 0); }
-      button.destructive-action:backdrop:disabled, button.destructive-action.flat:backdrop:disabled, button.destructive-action.sidebar-button:backdrop:disabled, headerbar button.destructive-action.titlebutton:backdrop:disabled,
+      notebook > header > tabs > arrow.destructive-action:backdrop:disabled, notebook > header > tabs > arrow.destructive-action.flat:backdrop:disabled,
+      button.destructive-action:backdrop:disabled,
+      button.destructive-action.flat:backdrop:disabled,
+      notebook > header > tabs > arrow.destructive-action:backdrop:disabled,
+      button.destructive-action.sidebar-button:backdrop:disabled,
+      headerbar button.destructive-action.titlebutton:backdrop:disabled,
       .titlebar button.destructive-action.titlebutton:backdrop:disabled {
         color: #5d6767;
         border-color: #1f2222;
@@ -858,16 +1048,38 @@ button, headerbar button.titlebutton,
         text-shadow: none;
         -gtk-icon-shadow: none;
         box-shadow: inset 0 1px rgba(255, 255, 255, 0), 0 1px rgba(238, 238, 236, 0); }
-        button.destructive-action:backdrop:disabled:active, button.destructive-action:backdrop:disabled:checked, button.destructive-action.flat:backdrop:disabled:active, button.destructive-action.sidebar-button:backdrop:disabled:active, headerbar button.destructive-action.titlebutton:backdrop:disabled:active,
-        .titlebar button.destructive-action.titlebutton:backdrop:disabled:active, button.destructive-action.flat:backdrop:disabled:checked, button.destructive-action.sidebar-button:backdrop:disabled:checked, headerbar button.destructive-action.titlebutton:backdrop:disabled:checked,
+        notebook > header > tabs > arrow.destructive-action:backdrop:disabled:active, notebook > header > tabs > arrow.destructive-action:backdrop:disabled:checked, notebook > header > tabs > arrow.destructive-action.flat:backdrop:disabled:active, notebook > header > tabs > arrow.destructive-action.flat:backdrop:disabled:checked,
+        button.destructive-action:backdrop:disabled:active,
+        button.destructive-action:backdrop:disabled:checked,
+        button.destructive-action.flat:backdrop:disabled:active,
+        notebook > header > tabs > arrow.destructive-action:backdrop:disabled:active,
+        button.destructive-action.sidebar-button:backdrop:disabled:active,
+        headerbar button.destructive-action.titlebutton:backdrop:disabled:active,
+        .titlebar button.destructive-action.titlebutton:backdrop:disabled:active,
+        button.destructive-action.flat:backdrop:disabled:checked,
+        notebook > header > tabs > arrow.destructive-action:backdrop:disabled:checked,
+        button.destructive-action.sidebar-button:backdrop:disabled:checked,
+        headerbar button.destructive-action.titlebutton:backdrop:disabled:checked,
         .titlebar button.destructive-action.titlebutton:backdrop:disabled:checked {
           color: #c46565;
           border-color: #5e0707;
           background-image: linear-gradient(to bottom, #a41212);
           box-shadow: inset 0 1px rgba(255, 255, 255, 0), 0 1px rgba(238, 238, 236, 0); }
-    button.destructive-action.flat:backdrop, button.destructive-action.sidebar-button:backdrop, headerbar button.destructive-action.titlebutton:backdrop,
-    .titlebar button.destructive-action.titlebutton:backdrop, button.destructive-action.flat:disabled, button.destructive-action.sidebar-button:disabled, headerbar button.destructive-action.titlebutton:disabled,
-    .titlebar button.destructive-action.titlebutton:disabled, button.destructive-action.flat:backdrop:disabled, button.destructive-action.sidebar-button:backdrop:disabled, headerbar button.destructive-action.titlebutton:backdrop:disabled,
+    notebook > header > tabs > arrow.destructive-action.flat:backdrop, notebook > header > tabs > arrow.destructive-action.flat:disabled, notebook > header > tabs > arrow.destructive-action.flat:backdrop:disabled,
+    button.destructive-action.flat:backdrop,
+    notebook > header > tabs > arrow.destructive-action:backdrop,
+    button.destructive-action.sidebar-button:backdrop,
+    headerbar button.destructive-action.titlebutton:backdrop,
+    .titlebar button.destructive-action.titlebutton:backdrop,
+    button.destructive-action.flat:disabled,
+    notebook > header > tabs > arrow.destructive-action:disabled,
+    button.destructive-action.sidebar-button:disabled,
+    headerbar button.destructive-action.titlebutton:disabled,
+    .titlebar button.destructive-action.titlebutton:disabled,
+    button.destructive-action.flat:backdrop:disabled,
+    notebook > header > tabs > arrow.destructive-action:backdrop:disabled,
+    button.destructive-action.sidebar-button:backdrop:disabled,
+    headerbar button.destructive-action.titlebutton:backdrop:disabled,
     .titlebar button.destructive-action.titlebutton:backdrop:disabled {
       border-color: transparent;
       background-color: transparent;
@@ -876,6 +1088,7 @@ button, headerbar button.titlebutton,
       text-shadow: none;
       -gtk-icon-shadow: none;
       color: rgba(213, 16, 16, 0.8); }
+    notebook > header > tabs > arrow.destructive-action:disabled,
     button.destructive-action:disabled {
       color: #949796;
       border-color: #1c1f1f;
@@ -883,12 +1096,15 @@ button, headerbar button.titlebutton,
       text-shadow: none;
       -gtk-icon-shadow: none;
       box-shadow: inset 0 1px rgba(255, 255, 255, 0), 0 1px rgba(238, 238, 236, 0); }
-      button.destructive-action:disabled:active, button.destructive-action:disabled:checked {
+      notebook > header > tabs > arrow.destructive-action:disabled:active, notebook > header > tabs > arrow.destructive-action:disabled:checked,
+      button.destructive-action:disabled:active,
+      button.destructive-action:disabled:checked {
         color: #dba0a0;
         border-color: #5e0707;
         background-image: linear-gradient(to bottom, #9d1111, #a41212);
         box-shadow: inset 0 1px rgba(255, 255, 255, 0), 0 1px rgba(238, 238, 236, 0); }
-    .osd button.destructive-action {
+    .osd notebook > header > tabs > arrow.destructive-action, .osd
+    button.destructive-action {
       color: #eeeeec;
       border-color: rgba(0, 0, 0, 0.7);
       background-image: linear-gradient(to bottom, rgba(213, 16, 16, 0.5));
@@ -897,7 +1113,8 @@ button, headerbar button.titlebutton,
       text-shadow: 0 1px black;
       -gtk-icon-shadow: 0 1px black;
       outline-color: rgba(238, 238, 236, 0.3); }
-      .osd button.destructive-action:hover {
+      .osd notebook > header > tabs > arrow.destructive-action:hover, .osd
+      button.destructive-action:hover {
         color: white;
         border-color: rgba(0, 0, 0, 0.7);
         background-image: linear-gradient(to bottom, rgba(213, 16, 16, 0.7));
@@ -906,7 +1123,11 @@ button, headerbar button.titlebutton,
         text-shadow: 0 1px black;
         -gtk-icon-shadow: 0 1px black;
         outline-color: rgba(238, 238, 236, 0.3); }
-      .osd button.destructive-action:active, .osd button.destructive-action:checked, .osd button.destructive-action:backdrop:active, .osd button.destructive-action:backdrop:checked {
+      .osd notebook > header > tabs > arrow.destructive-action:active, .osd notebook > header > tabs > arrow.destructive-action:checked, .osd notebook > header > tabs > arrow.destructive-action:backdrop:active, .osd notebook > header > tabs > arrow.destructive-action:backdrop:checked, .osd
+      button.destructive-action:active, .osd
+      button.destructive-action:checked, .osd
+      button.destructive-action:backdrop:active, .osd
+      button.destructive-action:backdrop:checked {
         color: white;
         border-color: rgba(0, 0, 0, 0.7);
         background-image: linear-gradient(to bottom, #d51010);
@@ -915,7 +1136,9 @@ button, headerbar button.titlebutton,
         text-shadow: none;
         -gtk-icon-shadow: none;
         outline-color: rgba(238, 238, 236, 0.3); }
-      .osd button.destructive-action:disabled, .osd button.destructive-action:backdrop:disabled {
+      .osd notebook > header > tabs > arrow.destructive-action:disabled, .osd notebook > header > tabs > arrow.destructive-action:backdrop:disabled, .osd
+      button.destructive-action:disabled, .osd
+      button.destructive-action:backdrop:disabled {
         color: #878a89;
         border-color: rgba(0, 0, 0, 0.7);
         background-image: linear-gradient(to bottom, rgba(53, 57, 58, 0.5));
@@ -923,7 +1146,8 @@ button, headerbar button.titlebutton,
         box-shadow: none;
         text-shadow: none;
         -gtk-icon-shadow: none; }
-      .osd button.destructive-action:backdrop {
+      .osd notebook > header > tabs > arrow.destructive-action:backdrop, .osd
+      button.destructive-action:backdrop {
         color: #eeeeec;
         border-color: rgba(0, 0, 0, 0.7);
         background-image: linear-gradient(to bottom, rgba(213, 16, 16, 0.5));
@@ -931,57 +1155,79 @@ button, headerbar button.titlebutton,
         box-shadow: none;
         text-shadow: none;
         -gtk-icon-shadow: none; }
-  button.text-button, headerbar button.text-button.titlebutton,
+  notebook > header > tabs > arrow.text-button,
+  button.text-button,
+  headerbar button.text-button.titlebutton,
   .titlebar button.text-button.titlebutton {
     padding-left: 16px;
     padding-right: 16px; }
+  notebook > header > tabs > arrow.text-button.image-button label:first-child,
   button.text-button.image-button label:first-child {
     padding-left: 8px; }
+  notebook > header > tabs > arrow.text-button.image-button label:last-child,
   button.text-button.image-button label:last-child {
     padding-right: 8px; }
-  .stack-switcher > button, headerbar .stack-switcher > button.titlebutton,
+  notebook > header > tabs.stack-switcher > arrow, .stack-switcher >
+  button, headerbar .stack-switcher > button.titlebutton,
   .titlebar .stack-switcher > button.titlebutton {
     outline-offset: -3px; }
-    .stack-switcher > button > label,
+    notebook > header > tabs.stack-switcher > arrow > label, .stack-switcher >
+    button > label,
     .titlebar .stack-switcher > button.titlebutton > label {
       padding-left: 6px;
       padding-right: 6px; }
-    .stack-switcher > button > image,
+    notebook > header > tabs.stack-switcher > arrow > image, .stack-switcher >
+    button > image,
     .titlebar .stack-switcher > button.titlebutton > image {
       padding-left: 6px;
       padding-right: 6px;
       padding-top: 3px;
       padding-bottom: 3px; }
-    .stack-switcher > button.text-button, headerbar .stack-switcher > button.text-button.titlebutton,
+    notebook > header > tabs.stack-switcher > arrow.text-button, .stack-switcher >
+    button.text-button, headerbar .stack-switcher > button.text-button.titlebutton,
     .titlebar .stack-switcher > button.text-button.titlebutton {
       padding-left: 10px;
       padding-right: 10px; }
-    .stack-switcher > button.image-button, headerbar .stack-switcher > button.image-button.titlebutton,
+    notebook > header > tabs.stack-switcher > arrow.image-button, .stack-switcher >
+    button.image-button, headerbar .stack-switcher > button.image-button.titlebutton,
     .titlebar .stack-switcher > button.image-button.titlebutton {
       padding-left: 2px;
       padding-right: 2px; }
-    .stack-switcher > button.needs-attention:active > label, .stack-switcher > button.needs-attention:active > image, .stack-switcher > button.needs-attention:checked > label, .stack-switcher > button.needs-attention:checked > image {
+    notebook > header > tabs.stack-switcher > arrow.needs-attention:active > label, notebook > header > tabs.stack-switcher > arrow.needs-attention:active > image, notebook > header > tabs.stack-switcher > arrow.needs-attention:checked > label, notebook > header > tabs.stack-switcher > arrow.needs-attention:checked > image, .stack-switcher >
+    button.needs-attention:active > label, .stack-switcher >
+    button.needs-attention:active > image, .stack-switcher >
+    button.needs-attention:checked > label, .stack-switcher >
+    button.needs-attention:checked > image {
       animation: none;
       background-image: none; }
-  .inline-toolbar button, .inline-toolbar headerbar button.titlebutton, headerbar .inline-toolbar button.titlebutton,
+  .inline-toolbar notebook > header > tabs > arrow, .inline-toolbar notebook > header > tabs > arrow:backdrop, .inline-toolbar
+  button, .inline-toolbar headerbar button.titlebutton, headerbar .inline-toolbar button.titlebutton,
   .inline-toolbar .titlebar button.titlebutton,
-  .titlebar .inline-toolbar button.titlebutton, .inline-toolbar button:backdrop {
+  .titlebar .inline-toolbar button.titlebutton, .inline-toolbar
+  button:backdrop {
     border-radius: 2px;
     border-width: 1px; }
-  .primary-toolbar button, .primary-toolbar headerbar button.titlebutton, headerbar .primary-toolbar button.titlebutton,
+  .primary-toolbar notebook > header > tabs > arrow, .primary-toolbar
+  button, .primary-toolbar headerbar button.titlebutton, headerbar .primary-toolbar button.titlebutton,
   .primary-toolbar .titlebar button.titlebutton,
   .titlebar .primary-toolbar button.titlebutton {
     -gtk-icon-shadow: none; }
 
-.stack-switcher > button.needs-attention > label, .stack-switcher > button.needs-attention > image, stacksidebar row.needs-attention > label {
+notebook > header > tabs.stack-switcher > arrow.needs-attention > label, notebook > header > tabs.stack-switcher > arrow.needs-attention > image, .stack-switcher >
+button.needs-attention > label, .stack-switcher >
+button.needs-attention > image, stacksidebar row.needs-attention > label {
   animation: needs_attention 150ms ease-in;
   background-image: -gtk-gradient(radial, center center, 0, center center, 0.5, to(#3583d5), to(transparent)), -gtk-gradient(radial, center center, 0, center center, 0.45, to(rgba(0, 0, 0, 0.81176)), to(transparent));
   background-size: 6px 6px, 6px 6px;
   background-repeat: no-repeat;
   background-position: right 3px, right 2px; }
-  .stack-switcher > button.needs-attention > label:backdrop, .stack-switcher > button.needs-attention > image:backdrop, stacksidebar row.needs-attention > label:backdrop {
+  notebook > header > tabs.stack-switcher > arrow.needs-attention > label:backdrop, notebook > header > tabs.stack-switcher > arrow.needs-attention > image:backdrop, .stack-switcher >
+  button.needs-attention > label:backdrop, .stack-switcher >
+  button.needs-attention > image:backdrop, stacksidebar row.needs-attention > label:backdrop {
     background-size: 6px 6px, 0 0; }
-  .stack-switcher > button.needs-attention > label:dir(rtl), .stack-switcher > button.needs-attention > image:dir(rtl), stacksidebar row.needs-attention > label:dir(rtl) {
+  notebook > header > tabs.stack-switcher > arrow.needs-attention > label:dir(rtl), notebook > header > tabs.stack-switcher > arrow.needs-attention > image:dir(rtl), .stack-switcher >
+  button.needs-attention > label:dir(rtl), .stack-switcher >
+  button.needs-attention > image:dir(rtl), stacksidebar row.needs-attention > label:dir(rtl) {
     background-position: left 3px, left 2px; }
 
 .inline-toolbar toolbutton > button, .inline-toolbar headerbar toolbutton > button.titlebutton,
@@ -1079,14 +1325,23 @@ searchbar.inline-toolbar toolbutton:backdrop > button.sidebar-button,
 .inline-toolbar headerbar toolbutton:backdrop > button.titlebutton,
 headerbar .inline-toolbar toolbutton:backdrop > button.titlebutton,
 .inline-toolbar .titlebar toolbutton:backdrop > button.titlebutton,
-.titlebar .inline-toolbar toolbutton:backdrop > button.titlebutton, .linked:not(.vertical) > entry, .linked:not(.vertical) > spinbutton:not(.vertical), .inline-toolbar button, .inline-toolbar headerbar button.titlebutton, headerbar .inline-toolbar button.titlebutton,
+.titlebar .inline-toolbar toolbutton:backdrop > button.titlebutton, .linked:not(.vertical) > entry, .linked:not(.vertical) > spinbutton:not(.vertical), .inline-toolbar notebook > header > tabs > arrow, .inline-toolbar notebook > header > tabs > arrow:backdrop, .inline-toolbar
+button, .inline-toolbar headerbar button.titlebutton, headerbar .inline-toolbar button.titlebutton,
 .inline-toolbar .titlebar button.titlebutton,
-.titlebar .inline-toolbar button.titlebutton, .inline-toolbar button:backdrop, .linked > button, headerbar .linked > button.titlebutton,
-.titlebar .linked > button.titlebutton, .linked > button:hover, .linked > button:active, .linked > button:checked, .linked > button:backdrop, .linked > combobox > button.combo:dir(ltr), .linked > combobox > button.combo:dir(rtl) {
+.titlebar .inline-toolbar button.titlebutton, .inline-toolbar
+button:backdrop, notebook > header > tabs.linked > arrow, notebook > header > tabs.linked > arrow:hover, notebook > header > tabs.linked > arrow:active, notebook > header > tabs.linked > arrow:checked, notebook > header > tabs.linked > arrow:backdrop, .linked >
+button, headerbar .linked > button.titlebutton,
+.titlebar .linked > button.titlebutton, .linked >
+button:hover, .linked >
+button:active, .linked >
+button:checked, .linked >
+button:backdrop, .linked > combobox > button.combo:dir(ltr), .linked > combobox > button.combo:dir(rtl) {
   border-radius: 0;
   border-right-style: none; }
 
-.linked:not(.vertical) > entry:first-child, .linked:not(.vertical) > spinbutton:first-child:not(.vertical), .inline-toolbar button:first-child, .linked > button:first-child, headerbar .linked > button.titlebutton:first-child,
+.linked:not(.vertical) > entry:first-child, .linked:not(.vertical) > spinbutton:first-child:not(.vertical), .inline-toolbar notebook > header > tabs > arrow:first-child, .inline-toolbar notebook > header > tabs > arrow:first-child:backdrop, .inline-toolbar
+button:first-child, notebook > header > tabs.linked > arrow:first-child, notebook > header > tabs.linked > arrow:first-child:hover, notebook > header > tabs.linked > arrow:first-child:active, notebook > header > tabs.linked > arrow:first-child:checked, notebook > header > tabs.linked > arrow:first-child:backdrop, .linked >
+button:first-child, headerbar .linked > button.titlebutton:first-child,
 .titlebar .linked > button.titlebutton:first-child, toolbar.inline-toolbar toolbutton:first-child > button.flat, .inline-toolbar toolbutton:first-child > button.flat, searchbar.inline-toolbar toolbutton:first-child > button.flat,
 .inline-toolbar.location-bar toolbutton:first-child > button.flat, toolbar.inline-toolbar toolbutton:first-child > button.sidebar-button, .inline-toolbar toolbutton:first-child > button.sidebar-button, searchbar.inline-toolbar toolbutton:first-child > button.sidebar-button,
 .inline-toolbar.location-bar toolbutton:first-child > button.sidebar-button, .inline-toolbar headerbar toolbutton:first-child > button.titlebutton, headerbar .inline-toolbar toolbutton:first-child > button.titlebutton,
@@ -1106,7 +1361,9 @@ headerbar .inline-toolbar toolbutton:backdrop:first-child > button.titlebutton,
 .titlebar .inline-toolbar toolbutton:backdrop:first-child > button.titlebutton, combobox.linked button:nth-child(2):dir(rtl), .linked:not(.vertical) > combobox:first-child > button.combo {
   border-top-left-radius: 3px;
   border-bottom-left-radius: 3px; }
-.linked:not(.vertical) > entry:last-child, .linked:not(.vertical) > spinbutton:last-child:not(.vertical), .inline-toolbar button:last-child, .linked > button:last-child, headerbar .linked > button.titlebutton:last-child,
+.linked:not(.vertical) > entry:last-child, .linked:not(.vertical) > spinbutton:last-child:not(.vertical), .inline-toolbar notebook > header > tabs > arrow:last-child, .inline-toolbar notebook > header > tabs > arrow:last-child:backdrop, .inline-toolbar
+button:last-child, notebook > header > tabs.linked > arrow:last-child, notebook > header > tabs.linked > arrow:last-child:hover, notebook > header > tabs.linked > arrow:last-child:active, notebook > header > tabs.linked > arrow:last-child:checked, notebook > header > tabs.linked > arrow:last-child:backdrop, .linked >
+button:last-child, headerbar .linked > button.titlebutton:last-child,
 .titlebar .linked > button.titlebutton:last-child, toolbar.inline-toolbar toolbutton:last-child > button.flat, .inline-toolbar toolbutton:last-child > button.flat, searchbar.inline-toolbar toolbutton:last-child > button.flat,
 .inline-toolbar.location-bar toolbutton:last-child > button.flat, toolbar.inline-toolbar toolbutton:last-child > button.sidebar-button, .inline-toolbar toolbutton:last-child > button.sidebar-button, searchbar.inline-toolbar toolbutton:last-child > button.sidebar-button,
 .inline-toolbar.location-bar toolbutton:last-child > button.sidebar-button, .inline-toolbar headerbar toolbutton:last-child > button.titlebutton, headerbar .inline-toolbar toolbutton:last-child > button.titlebutton,
@@ -1127,7 +1384,9 @@ headerbar .inline-toolbar toolbutton:backdrop:last-child > button.titlebutton,
   border-top-right-radius: 3px;
   border-bottom-right-radius: 3px;
   border-right-style: solid; }
-.linked:not(.vertical) > entry:only-child, .linked:not(.vertical) > spinbutton:only-child:not(.vertical), .inline-toolbar button:only-child, .linked > button:only-child, headerbar .linked > button.titlebutton:only-child,
+.linked:not(.vertical) > entry:only-child, .linked:not(.vertical) > spinbutton:only-child:not(.vertical), .inline-toolbar notebook > header > tabs > arrow:only-child, .inline-toolbar notebook > header > tabs > arrow:only-child:backdrop, .inline-toolbar
+button:only-child, notebook > header > tabs.linked > arrow:only-child, notebook > header > tabs.linked > arrow:only-child:hover, notebook > header > tabs.linked > arrow:only-child:active, notebook > header > tabs.linked > arrow:only-child:checked, notebook > header > tabs.linked > arrow:only-child:backdrop, .linked >
+button:only-child, headerbar .linked > button.titlebutton:only-child,
 .titlebar .linked > button.titlebutton:only-child, toolbar.inline-toolbar toolbutton:only-child > button.flat, .inline-toolbar toolbutton:only-child > button.flat, searchbar.inline-toolbar toolbutton:only-child > button.flat,
 .inline-toolbar.location-bar toolbutton:only-child > button.flat, toolbar.inline-toolbar toolbutton:only-child > button.sidebar-button, .inline-toolbar toolbutton:only-child > button.sidebar-button, searchbar.inline-toolbar toolbutton:only-child > button.sidebar-button,
 .inline-toolbar.location-bar toolbutton:only-child > button.sidebar-button, .inline-toolbar headerbar toolbutton:only-child > button.titlebutton, headerbar .inline-toolbar toolbutton:only-child > button.titlebutton,
@@ -1148,21 +1407,29 @@ headerbar .inline-toolbar toolbutton:backdrop:only-child > button.titlebutton,
   border-radius: 3px;
   border-style: solid; }
 
-.linked.vertical > entry, .linked.vertical > spinbutton:not(.vertical), .linked.vertical > button, headerbar .linked.vertical > button.titlebutton,
-.titlebar .linked.vertical > button.titlebutton, .linked.vertical > button:hover, .linked.vertical > button:active, .linked.vertical > button:checked, .linked.vertical > button:backdrop, .linked.vertical > combobox > button.combo {
+.linked.vertical > entry, .linked.vertical > spinbutton:not(.vertical), notebook > header > tabs.linked.vertical > arrow, notebook > header > tabs.linked.vertical > arrow:hover, notebook > header > tabs.linked.vertical > arrow:active, notebook > header > tabs.linked.vertical > arrow:checked, notebook > header > tabs.linked.vertical > arrow:backdrop, .linked.vertical >
+button, headerbar .linked.vertical > button.titlebutton,
+.titlebar .linked.vertical > button.titlebutton, .linked.vertical >
+button:hover, .linked.vertical >
+button:active, .linked.vertical >
+button:checked, .linked.vertical >
+button:backdrop, .linked.vertical > combobox > button.combo {
   border-style: solid solid none solid;
   border-radius: 0; }
 
-.linked.vertical > entry:first-child, .linked.vertical > spinbutton:first-child:not(.vertical), .linked.vertical > button:first-child, headerbar .linked.vertical > button.titlebutton:first-child,
+.linked.vertical > entry:first-child, .linked.vertical > spinbutton:first-child:not(.vertical), notebook > header > tabs.linked.vertical > arrow:first-child, notebook > header > tabs.linked.vertical > arrow:first-child:hover, notebook > header > tabs.linked.vertical > arrow:first-child:active, notebook > header > tabs.linked.vertical > arrow:first-child:checked, notebook > header > tabs.linked.vertical > arrow:first-child:backdrop, .linked.vertical >
+button:first-child, headerbar .linked.vertical > button.titlebutton:first-child,
 .titlebar .linked.vertical > button.titlebutton:first-child, .linked.vertical > combobox:first-child > button.combo {
   border-top-left-radius: 3px;
   border-top-right-radius: 3px; }
-.linked.vertical > entry:last-child, .linked.vertical > spinbutton:last-child:not(.vertical), .linked.vertical > button:last-child, headerbar .linked.vertical > button.titlebutton:last-child,
+.linked.vertical > entry:last-child, .linked.vertical > spinbutton:last-child:not(.vertical), notebook > header > tabs.linked.vertical > arrow:last-child, notebook > header > tabs.linked.vertical > arrow:last-child:hover, notebook > header > tabs.linked.vertical > arrow:last-child:active, notebook > header > tabs.linked.vertical > arrow:last-child:checked, notebook > header > tabs.linked.vertical > arrow:last-child:backdrop, .linked.vertical >
+button:last-child, headerbar .linked.vertical > button.titlebutton:last-child,
 .titlebar .linked.vertical > button.titlebutton:last-child, .linked.vertical > combobox:last-child > button.combo {
   border-bottom-left-radius: 3px;
   border-bottom-right-radius: 3px;
   border-style: solid; }
-.linked.vertical > entry:only-child, .linked.vertical > spinbutton:only-child:not(.vertical), .linked.vertical > button:only-child, headerbar .linked.vertical > button.titlebutton:only-child,
+.linked.vertical > entry:only-child, .linked.vertical > spinbutton:only-child:not(.vertical), notebook > header > tabs.linked.vertical > arrow:only-child, notebook > header > tabs.linked.vertical > arrow:only-child:hover, notebook > header > tabs.linked.vertical > arrow:only-child:active, notebook > header > tabs.linked.vertical > arrow:only-child:checked, notebook > header > tabs.linked.vertical > arrow:only-child:backdrop, .linked.vertical >
+button:only-child, headerbar .linked.vertical > button.titlebutton:only-child,
 .titlebar .linked.vertical > button.titlebutton:only-child, .linked.vertical > combobox:only-child > button.combo {
   border-radius: 3px;
   border-style: solid; }
@@ -1619,9 +1886,10 @@ headerbar {
       text-shadow: 0 -1px rgba(0, 0, 0, 0.70353);
       -gtk-icon-shadow: 0 -1px rgba(0, 0, 0, 0.70353);
       box-shadow: inset 0 1px rgba(255, 255, 255, 0.05), 0 1px rgba(40, 98, 159, 0); }
-      .selection-mode.titlebar:not(headerbar) button.flat, .selection-mode.titlebar:not(headerbar) button.sidebar-button,
+      .selection-mode.titlebar:not(headerbar) button.flat, .selection-mode.titlebar:not(headerbar) notebook > header > tabs > arrow, .selection-mode.titlebar:not(headerbar) button.sidebar-button,
       .selection-mode.titlebar:not(headerbar) button.titlebutton,
       headerbar.selection-mode button.flat,
+      headerbar.selection-mode notebook > header > tabs > arrow,
       headerbar.selection-mode button.sidebar-button,
       headerbar.selection-mode button.titlebutton {
         border-color: transparent;
@@ -1655,10 +1923,11 @@ headerbar {
         text-shadow: 0 -1px rgba(0, 0, 0, 0.78353);
         -gtk-icon-shadow: 0 -1px rgba(0, 0, 0, 0.78353);
         box-shadow: inset 0 2px 1px -2px rgba(0, 0, 0, 0.6), 0 1px rgba(40, 98, 159, 0); }
-      .selection-mode.titlebar:not(headerbar) button:backdrop, .selection-mode.titlebar:not(headerbar) button.flat:backdrop, .selection-mode.titlebar:not(headerbar) button.sidebar-button:backdrop,
+      .selection-mode.titlebar:not(headerbar) button:backdrop, .selection-mode.titlebar:not(headerbar) button.flat:backdrop, .selection-mode.titlebar:not(headerbar) notebook > header > tabs > arrow:backdrop, .selection-mode.titlebar:not(headerbar) button.sidebar-button:backdrop,
       .selection-mode.titlebar:not(headerbar) button.titlebutton:backdrop,
       headerbar.selection-mode button:backdrop,
       headerbar.selection-mode button.flat:backdrop,
+      headerbar.selection-mode notebook > header > tabs > arrow:backdrop,
       headerbar.selection-mode button.sidebar-button:backdrop,
       headerbar.selection-mode button.titlebutton:backdrop {
         color: #d3dfeb;
@@ -1669,15 +1938,17 @@ headerbar {
         box-shadow: inset 0 1px rgba(255, 255, 255, 0), 0 1px rgba(40, 98, 159, 0);
         -gtk-icon-effect: none;
         border-color: #0f2b48; }
-        .selection-mode.titlebar:not(headerbar) button:backdrop:active, .selection-mode.titlebar:not(headerbar) button:backdrop:checked, .selection-mode.titlebar:not(headerbar) button.flat:backdrop:active, .selection-mode.titlebar:not(headerbar) button.sidebar-button:backdrop:active,
-        .selection-mode.titlebar:not(headerbar) button.titlebutton:backdrop:active, .selection-mode.titlebar:not(headerbar) button.flat:backdrop:checked, .selection-mode.titlebar:not(headerbar) button.sidebar-button:backdrop:checked,
+        .selection-mode.titlebar:not(headerbar) button:backdrop:active, .selection-mode.titlebar:not(headerbar) button:backdrop:checked, .selection-mode.titlebar:not(headerbar) button.flat:backdrop:active, .selection-mode.titlebar:not(headerbar) notebook > header > tabs > arrow:backdrop:active, .selection-mode.titlebar:not(headerbar) button.sidebar-button:backdrop:active,
+        .selection-mode.titlebar:not(headerbar) button.titlebutton:backdrop:active, .selection-mode.titlebar:not(headerbar) button.flat:backdrop:checked, .selection-mode.titlebar:not(headerbar) notebook > header > tabs > arrow:backdrop:checked, .selection-mode.titlebar:not(headerbar) button.sidebar-button:backdrop:checked,
         .selection-mode.titlebar:not(headerbar) button.titlebutton:backdrop:checked,
         headerbar.selection-mode button:backdrop:active,
         headerbar.selection-mode button:backdrop:checked,
         headerbar.selection-mode button.flat:backdrop:active,
+        headerbar.selection-mode notebook > header > tabs > arrow:backdrop:active,
         headerbar.selection-mode button.sidebar-button:backdrop:active,
         headerbar.selection-mode button.titlebutton:backdrop:active,
         headerbar.selection-mode button.flat:backdrop:checked,
+        headerbar.selection-mode notebook > header > tabs > arrow:backdrop:checked,
         headerbar.selection-mode button.sidebar-button:backdrop:checked,
         headerbar.selection-mode button.titlebutton:backdrop:checked {
           color: #d1dae3;
@@ -1685,10 +1956,11 @@ headerbar {
           background-image: linear-gradient(to bottom, #184472);
           box-shadow: inset 0 1px rgba(255, 255, 255, 0), 0 1px rgba(40, 98, 159, 0);
           border-color: #0f2b48; }
-        .selection-mode.titlebar:not(headerbar) button:backdrop:disabled, .selection-mode.titlebar:not(headerbar) button.flat:backdrop:disabled, .selection-mode.titlebar:not(headerbar) button.sidebar-button:backdrop:disabled,
+        .selection-mode.titlebar:not(headerbar) button:backdrop:disabled, .selection-mode.titlebar:not(headerbar) button.flat:backdrop:disabled, .selection-mode.titlebar:not(headerbar) notebook > header > tabs > arrow:backdrop:disabled, .selection-mode.titlebar:not(headerbar) button.sidebar-button:backdrop:disabled,
         .selection-mode.titlebar:not(headerbar) button.titlebutton:backdrop:disabled,
         headerbar.selection-mode button:backdrop:disabled,
         headerbar.selection-mode button.flat:backdrop:disabled,
+        headerbar.selection-mode notebook > header > tabs > arrow:backdrop:disabled,
         headerbar.selection-mode button.sidebar-button:backdrop:disabled,
         headerbar.selection-mode button.titlebutton:backdrop:disabled {
           color: #6f91b4;
@@ -1698,15 +1970,17 @@ headerbar {
           -gtk-icon-shadow: none;
           box-shadow: inset 0 1px rgba(255, 255, 255, 0), 0 1px rgba(40, 98, 159, 0);
           border-color: #0f2b48; }
-        .selection-mode.titlebar:not(headerbar) button:backdrop:disabled:active, .selection-mode.titlebar:not(headerbar) button:backdrop:disabled:checked, .selection-mode.titlebar:not(headerbar) button.flat:backdrop:disabled:active, .selection-mode.titlebar:not(headerbar) button.sidebar-button:backdrop:disabled:active,
-        .selection-mode.titlebar:not(headerbar) button.titlebutton:backdrop:disabled:active, .selection-mode.titlebar:not(headerbar) button.flat:backdrop:disabled:checked, .selection-mode.titlebar:not(headerbar) button.sidebar-button:backdrop:disabled:checked,
+        .selection-mode.titlebar:not(headerbar) button:backdrop:disabled:active, .selection-mode.titlebar:not(headerbar) button:backdrop:disabled:checked, .selection-mode.titlebar:not(headerbar) button.flat:backdrop:disabled:active, .selection-mode.titlebar:not(headerbar) notebook > header > tabs > arrow:backdrop:disabled:active, .selection-mode.titlebar:not(headerbar) button.sidebar-button:backdrop:disabled:active,
+        .selection-mode.titlebar:not(headerbar) button.titlebutton:backdrop:disabled:active, .selection-mode.titlebar:not(headerbar) button.flat:backdrop:disabled:checked, .selection-mode.titlebar:not(headerbar) notebook > header > tabs > arrow:backdrop:disabled:checked, .selection-mode.titlebar:not(headerbar) button.sidebar-button:backdrop:disabled:checked,
         .selection-mode.titlebar:not(headerbar) button.titlebutton:backdrop:disabled:checked,
         headerbar.selection-mode button:backdrop:disabled:active,
         headerbar.selection-mode button:backdrop:disabled:checked,
         headerbar.selection-mode button.flat:backdrop:disabled:active,
+        headerbar.selection-mode notebook > header > tabs > arrow:backdrop:disabled:active,
         headerbar.selection-mode button.sidebar-button:backdrop:disabled:active,
         headerbar.selection-mode button.titlebutton:backdrop:disabled:active,
         headerbar.selection-mode button.flat:backdrop:disabled:checked,
+        headerbar.selection-mode notebook > header > tabs > arrow:backdrop:disabled:checked,
         headerbar.selection-mode button.sidebar-button:backdrop:disabled:checked,
         headerbar.selection-mode button.titlebutton:backdrop:disabled:checked {
           color: #6c88a7;
@@ -1714,17 +1988,20 @@ headerbar {
           background-image: linear-gradient(to bottom, #1d4877);
           box-shadow: inset 0 1px rgba(255, 255, 255, 0), 0 1px rgba(40, 98, 159, 0);
           border-color: #0f2b48; }
-      .selection-mode.titlebar:not(headerbar) button.flat:backdrop, .selection-mode.titlebar:not(headerbar) button.sidebar-button:backdrop,
-      .selection-mode.titlebar:not(headerbar) button.titlebutton:backdrop, .selection-mode.titlebar:not(headerbar) button.flat:disabled, .selection-mode.titlebar:not(headerbar) button.sidebar-button:disabled,
-      .selection-mode.titlebar:not(headerbar) button.titlebutton:disabled, .selection-mode.titlebar:not(headerbar) button.flat:disabled:backdrop, .selection-mode.titlebar:not(headerbar) button.sidebar-button:disabled:backdrop,
+      .selection-mode.titlebar:not(headerbar) button.flat:backdrop, .selection-mode.titlebar:not(headerbar) notebook > header > tabs > arrow:backdrop, .selection-mode.titlebar:not(headerbar) button.sidebar-button:backdrop,
+      .selection-mode.titlebar:not(headerbar) button.titlebutton:backdrop, .selection-mode.titlebar:not(headerbar) button.flat:disabled, .selection-mode.titlebar:not(headerbar) notebook > header > tabs > arrow:disabled, .selection-mode.titlebar:not(headerbar) button.sidebar-button:disabled,
+      .selection-mode.titlebar:not(headerbar) button.titlebutton:disabled, .selection-mode.titlebar:not(headerbar) button.flat:disabled:backdrop, .selection-mode.titlebar:not(headerbar) notebook > header > tabs > arrow:disabled:backdrop, .selection-mode.titlebar:not(headerbar) button.sidebar-button:disabled:backdrop,
       .selection-mode.titlebar:not(headerbar) button.titlebutton:disabled:backdrop,
       headerbar.selection-mode button.flat:backdrop,
+      headerbar.selection-mode notebook > header > tabs > arrow:backdrop,
       headerbar.selection-mode button.sidebar-button:backdrop,
       headerbar.selection-mode button.titlebutton:backdrop,
       headerbar.selection-mode button.flat:disabled,
+      headerbar.selection-mode notebook > header > tabs > arrow:disabled,
       headerbar.selection-mode button.sidebar-button:disabled,
       headerbar.selection-mode button.titlebutton:disabled,
       headerbar.selection-mode button.flat:disabled:backdrop,
+      headerbar.selection-mode notebook > header > tabs > arrow:disabled:backdrop,
       headerbar.selection-mode button.sidebar-button:disabled:backdrop,
       headerbar.selection-mode button.titlebutton:disabled:backdrop {
         border-color: transparent;
@@ -2193,8 +2470,29 @@ notebook > header {
         box-shadow: none; }
       notebook > header.right > tabs > tab:active {
         box-shadow: inset 3px 0 #215d9c; }
-  notebook > header arrow:disabled {
-    color: #949796; }
+  notebook > header > tabs > arrow {
+    min-height: 16px;
+    min-width: 16px;
+    margin-left: -5px;
+    margin-right: -5px;
+    padding-left: 4px;
+    padding-right: 4px;
+    border-top-style: none;
+    border-radius: 0; }
+    notebook > header > tabs > arrow:hover:not(:active):not(:backdrop) {
+      background-image: none;
+      background-color: rgba(255, 255, 255, 0.3);
+      border-left-color: transparent;
+      border-right-color: transparent;
+      box-shadow: none; }
+    notebook > header > tabs > arrow:disabled {
+      background-image: none;
+      background-color: transparent;
+      border-color: transparent; }
+    notebook > header > tabs > arrow.down {
+      -gtk-icon-source: -gtk-icontheme("pan-start-symbolic"); }
+    notebook > header > tabs > arrow.up {
+      -gtk-icon-source: -gtk-icontheme("pan-end-symbolic"); }
   notebook > header tab {
     font-weight: bold;
     min-height: 36px;
@@ -2226,7 +2524,7 @@ notebook > header {
       notebook > header tab:backdrop:active.reorderable-page {
         border-color: #1f2222;
         background-color: #393f3f; }
-    notebook > header tab button.flat, notebook > header tab button.sidebar-button, notebook > header tab headerbar button.titlebutton, headerbar notebook > header tab button.titlebutton,
+    notebook > header tab button.flat, notebook > header tab notebook > header > tabs > arrow, notebook > header tab button.sidebar-button, notebook > header tab headerbar button.titlebutton, headerbar notebook > header tab button.titlebutton,
     notebook > header tab .titlebar button.titlebutton,
     .titlebar notebook > header tab button.titlebutton {
       padding: 0;
@@ -2234,22 +2532,22 @@ notebook > header {
       margin-bottom: 8px;
       min-width: 18px;
       min-height: 18px; }
-      notebook > header tab button.flat:hover, notebook > header tab button.sidebar-button:hover, notebook > header tab headerbar button.titlebutton:hover, headerbar notebook > header tab button.titlebutton:hover,
+      notebook > header tab button.flat:hover, notebook > header tab notebook > header > tabs > arrow:hover, notebook > header tab button.sidebar-button:hover, notebook > header tab headerbar button.titlebutton:hover, headerbar notebook > header tab button.titlebutton:hover,
       notebook > header tab .titlebar button.titlebutton:hover,
       .titlebar notebook > header tab button.titlebutton:hover {
         color: currentColor; }
-      notebook > header tab button.flat, notebook > header tab button.sidebar-button, notebook > header tab headerbar button.titlebutton, headerbar notebook > header tab button.titlebutton,
+      notebook > header tab button.flat, notebook > header tab notebook > header > tabs > arrow, notebook > header tab button.sidebar-button, notebook > header tab headerbar button.titlebutton, headerbar notebook > header tab button.titlebutton,
       notebook > header tab .titlebar button.titlebutton,
-      .titlebar notebook > header tab button.titlebutton, notebook > header tab button.flat:backdrop, notebook > header tab button.sidebar-button:backdrop, notebook > header tab headerbar button.titlebutton:backdrop, headerbar notebook > header tab button.titlebutton:backdrop,
+      .titlebar notebook > header tab button.titlebutton, notebook > header tab button.flat:backdrop, notebook > header tab notebook > header > tabs > arrow:backdrop, notebook > header tab button.sidebar-button:backdrop, notebook > header tab headerbar button.titlebutton:backdrop, headerbar notebook > header tab button.titlebutton:backdrop,
       notebook > header tab .titlebar button.titlebutton:backdrop,
       .titlebar notebook > header tab button.titlebutton:backdrop {
         color: alpha(currentColor,0.3); }
-      notebook > header tab button.flat:last-child, notebook > header tab button.sidebar-button:last-child, notebook > header tab headerbar button.titlebutton:last-child, headerbar notebook > header tab button.titlebutton:last-child,
+      notebook > header tab button.flat:last-child, notebook > header tab notebook > header > tabs > arrow:last-child, notebook > header tab button.sidebar-button:last-child, notebook > header tab headerbar button.titlebutton:last-child, headerbar notebook > header tab button.titlebutton:last-child,
       notebook > header tab .titlebar button.titlebutton:last-child,
       .titlebar notebook > header tab button.titlebutton:last-child {
         margin-left: 4px;
         margin-right: -4px; }
-      notebook > header tab button.flat:first-child, notebook > header tab button.sidebar-button:first-child, notebook > header tab headerbar button.titlebutton:first-child, headerbar notebook > header tab button.titlebutton:first-child,
+      notebook > header tab button.flat:first-child, notebook > header tab notebook > header > tabs > arrow:first-child, notebook > header tab button.sidebar-button:first-child, notebook > header tab headerbar button.titlebutton:first-child, headerbar notebook > header tab button.titlebutton:first-child,
       notebook > header tab .titlebar button.titlebutton:first-child,
       .titlebar notebook > header tab button.titlebutton:first-child {
         margin-left: -4px;
@@ -2457,7 +2755,7 @@ switch {
 treeview.check {
   -gtk-icon-source: -gtk-scaled(url("assets/checkbox-unchecked-dark.png"), url("assets/checkbox-unchecked-dark@2.png"));
   -gtk-icon-shadow: 0 1px 0 rgba(238, 238, 236, 0.07); }
-  treeview.check button.flat, treeview.check button.sidebar-button, treeview.check headerbar button.titlebutton, headerbar treeview.check button.titlebutton,
+  treeview.check button.flat, treeview.check notebook > header > tabs > arrow, treeview.check button.sidebar-button, treeview.check headerbar button.titlebutton, headerbar treeview.check button.titlebutton,
   treeview.check .titlebar button.titlebutton,
   .titlebar treeview.check button.titlebutton {
     -gtk-icon-shadow: none; }
@@ -2465,7 +2763,7 @@ treeview.check {
 treeview.check:hover {
   -gtk-icon-source: -gtk-scaled(url("assets/checkbox-unchecked-hover-dark.png"), url("assets/checkbox-unchecked-hover-dark@2.png"));
   -gtk-icon-shadow: 0 1px 0 rgba(238, 238, 236, 0.07); }
-  treeview.check:hover button.flat, treeview.check:hover button.sidebar-button, treeview.check:hover headerbar button.titlebutton, headerbar treeview.check:hover button.titlebutton,
+  treeview.check:hover button.flat, treeview.check:hover notebook > header > tabs > arrow, treeview.check:hover button.sidebar-button, treeview.check:hover headerbar button.titlebutton, headerbar treeview.check:hover button.titlebutton,
   treeview.check:hover .titlebar button.titlebutton,
   .titlebar treeview.check:hover button.titlebutton {
     -gtk-icon-shadow: none; }
@@ -2473,7 +2771,7 @@ treeview.check:hover {
 treeview.check:active {
   -gtk-icon-source: -gtk-scaled(url("assets/checkbox-unchecked-active-dark.png"), url("assets/checkbox-unchecked-active-dark@2.png"));
   -gtk-icon-shadow: 0 1px 0 rgba(238, 238, 236, 0.07); }
-  treeview.check:active button.flat, treeview.check:active button.sidebar-button, treeview.check:active headerbar button.titlebutton, headerbar treeview.check:active button.titlebutton,
+  treeview.check:active button.flat, treeview.check:active notebook > header > tabs > arrow, treeview.check:active button.sidebar-button, treeview.check:active headerbar button.titlebutton, headerbar treeview.check:active button.titlebutton,
   treeview.check:active .titlebar button.titlebutton,
   .titlebar treeview.check:active button.titlebutton {
     -gtk-icon-shadow: none; }
@@ -2481,7 +2779,7 @@ treeview.check:active {
 treeview.check:disabled {
   -gtk-icon-source: -gtk-scaled(url("assets/checkbox-unchecked-insensitive-dark.png"), url("assets/checkbox-unchecked-insensitive-dark@2.png"));
   -gtk-icon-shadow: 0 1px 0 rgba(238, 238, 236, 0.07); }
-  treeview.check:disabled button.flat, treeview.check:disabled button.sidebar-button, treeview.check:disabled headerbar button.titlebutton, headerbar treeview.check:disabled button.titlebutton,
+  treeview.check:disabled button.flat, treeview.check:disabled notebook > header > tabs > arrow, treeview.check:disabled button.sidebar-button, treeview.check:disabled headerbar button.titlebutton, headerbar treeview.check:disabled button.titlebutton,
   treeview.check:disabled .titlebar button.titlebutton,
   .titlebar treeview.check:disabled button.titlebutton {
     -gtk-icon-shadow: none; }
@@ -2489,7 +2787,7 @@ treeview.check:disabled {
 treeview.check:backdrop {
   -gtk-icon-source: -gtk-scaled(url("assets/checkbox-unchecked-backdrop-dark.png"), url("assets/checkbox-unchecked-backdrop-dark@2.png"));
   -gtk-icon-shadow: none; }
-  treeview.check:backdrop button.flat, treeview.check:backdrop button.sidebar-button, treeview.check:backdrop headerbar button.titlebutton, headerbar treeview.check:backdrop button.titlebutton,
+  treeview.check:backdrop button.flat, treeview.check:backdrop notebook > header > tabs > arrow, treeview.check:backdrop button.sidebar-button, treeview.check:backdrop headerbar button.titlebutton, headerbar treeview.check:backdrop button.titlebutton,
   treeview.check:backdrop .titlebar button.titlebutton,
   .titlebar treeview.check:backdrop button.titlebutton {
     -gtk-icon-shadow: none; }
@@ -2497,7 +2795,7 @@ treeview.check:backdrop {
 treeview.check:backdrop:disabled {
   -gtk-icon-source: -gtk-scaled(url("assets/checkbox-unchecked-backdrop-insensitive-dark.png"), url("assets/checkbox-unchecked-backdrop-insensitive-dark@2.png"));
   -gtk-icon-shadow: none; }
-  treeview.check:backdrop:disabled button.flat, treeview.check:backdrop:disabled button.sidebar-button, treeview.check:backdrop:disabled headerbar button.titlebutton, headerbar treeview.check:backdrop:disabled button.titlebutton,
+  treeview.check:backdrop:disabled button.flat, treeview.check:backdrop:disabled notebook > header > tabs > arrow, treeview.check:backdrop:disabled button.sidebar-button, treeview.check:backdrop:disabled headerbar button.titlebutton, headerbar treeview.check:backdrop:disabled button.titlebutton,
   treeview.check:backdrop:disabled .titlebar button.titlebutton,
   .titlebar treeview.check:backdrop:disabled button.titlebutton {
     -gtk-icon-shadow: none; }
@@ -2505,7 +2803,7 @@ treeview.check:backdrop:disabled {
 treeview.check:indeterminate {
   -gtk-icon-source: -gtk-scaled(url("assets/checkbox-mixed-dark.png"), url("assets/checkbox-mixed-dark@2.png"));
   -gtk-icon-shadow: 0 1px 0 rgba(238, 238, 236, 0.07); }
-  treeview.check:indeterminate button.flat, treeview.check:indeterminate button.sidebar-button, treeview.check:indeterminate headerbar button.titlebutton, headerbar treeview.check:indeterminate button.titlebutton,
+  treeview.check:indeterminate button.flat, treeview.check:indeterminate notebook > header > tabs > arrow, treeview.check:indeterminate button.sidebar-button, treeview.check:indeterminate headerbar button.titlebutton, headerbar treeview.check:indeterminate button.titlebutton,
   treeview.check:indeterminate .titlebar button.titlebutton,
   .titlebar treeview.check:indeterminate button.titlebutton {
     -gtk-icon-shadow: none; }
@@ -2513,7 +2811,7 @@ treeview.check:indeterminate {
 treeview.check:indeterminate:hover {
   -gtk-icon-source: -gtk-scaled(url("assets/checkbox-mixed-hover-dark.png"), url("assets/checkbox-mixed-hover-dark@2.png"));
   -gtk-icon-shadow: 0 1px 0 rgba(238, 238, 236, 0.07); }
-  treeview.check:indeterminate:hover button.flat, treeview.check:indeterminate:hover button.sidebar-button, treeview.check:indeterminate:hover headerbar button.titlebutton, headerbar treeview.check:indeterminate:hover button.titlebutton,
+  treeview.check:indeterminate:hover button.flat, treeview.check:indeterminate:hover notebook > header > tabs > arrow, treeview.check:indeterminate:hover button.sidebar-button, treeview.check:indeterminate:hover headerbar button.titlebutton, headerbar treeview.check:indeterminate:hover button.titlebutton,
   treeview.check:indeterminate:hover .titlebar button.titlebutton,
   .titlebar treeview.check:indeterminate:hover button.titlebutton {
     -gtk-icon-shadow: none; }
@@ -2521,7 +2819,7 @@ treeview.check:indeterminate:hover {
 treeview.check:indeterminate:selected {
   -gtk-icon-source: -gtk-scaled(url("assets/checkbox-mixed-active-dark.png"), url("assets/checkbox-mixed-active-dark@2.png"));
   -gtk-icon-shadow: 0 1px 0 rgba(238, 238, 236, 0.07); }
-  treeview.check:indeterminate:selected button.flat, treeview.check:indeterminate:selected button.sidebar-button, treeview.check:indeterminate:selected headerbar button.titlebutton, headerbar treeview.check:indeterminate:selected button.titlebutton,
+  treeview.check:indeterminate:selected button.flat, treeview.check:indeterminate:selected notebook > header > tabs > arrow, treeview.check:indeterminate:selected button.sidebar-button, treeview.check:indeterminate:selected headerbar button.titlebutton, headerbar treeview.check:indeterminate:selected button.titlebutton,
   treeview.check:indeterminate:selected .titlebar button.titlebutton,
   .titlebar treeview.check:indeterminate:selected button.titlebutton {
     -gtk-icon-shadow: none; }
@@ -2529,7 +2827,7 @@ treeview.check:indeterminate:selected {
 treeview.check:indeterminate:backdrop {
   -gtk-icon-source: -gtk-scaled(url("assets/checkbox-mixed-backdrop-dark.png"), url("assets/checkbox-mixed-backdrop-dark@2.png"));
   -gtk-icon-shadow: none; }
-  treeview.check:indeterminate:backdrop button.flat, treeview.check:indeterminate:backdrop button.sidebar-button, treeview.check:indeterminate:backdrop headerbar button.titlebutton, headerbar treeview.check:indeterminate:backdrop button.titlebutton,
+  treeview.check:indeterminate:backdrop button.flat, treeview.check:indeterminate:backdrop notebook > header > tabs > arrow, treeview.check:indeterminate:backdrop button.sidebar-button, treeview.check:indeterminate:backdrop headerbar button.titlebutton, headerbar treeview.check:indeterminate:backdrop button.titlebutton,
   treeview.check:indeterminate:backdrop .titlebar button.titlebutton,
   .titlebar treeview.check:indeterminate:backdrop button.titlebutton {
     -gtk-icon-shadow: none; }
@@ -2537,7 +2835,7 @@ treeview.check:indeterminate:backdrop {
 treeview.check:indeterminate:disabled {
   -gtk-icon-source: -gtk-scaled(url("assets/checkbox-mixed-insensitive-dark.png"), url("assets/checkbox-mixed-insensitive-dark@2.png"));
   -gtk-icon-shadow: 0 1px 0 rgba(238, 238, 236, 0.07); }
-  treeview.check:indeterminate:disabled button.flat, treeview.check:indeterminate:disabled button.sidebar-button, treeview.check:indeterminate:disabled headerbar button.titlebutton, headerbar treeview.check:indeterminate:disabled button.titlebutton,
+  treeview.check:indeterminate:disabled button.flat, treeview.check:indeterminate:disabled notebook > header > tabs > arrow, treeview.check:indeterminate:disabled button.sidebar-button, treeview.check:indeterminate:disabled headerbar button.titlebutton, headerbar treeview.check:indeterminate:disabled button.titlebutton,
   treeview.check:indeterminate:disabled .titlebar button.titlebutton,
   .titlebar treeview.check:indeterminate:disabled button.titlebutton {
     -gtk-icon-shadow: none; }
@@ -2545,7 +2843,7 @@ treeview.check:indeterminate:disabled {
 treeview.check:indeterminate:disabled:backdrop {
   -gtk-icon-source: -gtk-scaled(url("assets/checkbox-mixed-backdrop-insensitive-dark.png"), url("assets/checkbox-mixed-backdrop-insensitive-dark@2.png"));
   -gtk-icon-shadow: none; }
-  treeview.check:indeterminate:disabled:backdrop button.flat, treeview.check:indeterminate:disabled:backdrop button.sidebar-button, treeview.check:indeterminate:disabled:backdrop headerbar button.titlebutton, headerbar treeview.check:indeterminate:disabled:backdrop button.titlebutton,
+  treeview.check:indeterminate:disabled:backdrop button.flat, treeview.check:indeterminate:disabled:backdrop notebook > header > tabs > arrow, treeview.check:indeterminate:disabled:backdrop button.sidebar-button, treeview.check:indeterminate:disabled:backdrop headerbar button.titlebutton, headerbar treeview.check:indeterminate:disabled:backdrop button.titlebutton,
   treeview.check:indeterminate:disabled:backdrop .titlebar button.titlebutton,
   .titlebar treeview.check:indeterminate:disabled:backdrop button.titlebutton {
     -gtk-icon-shadow: none; }
@@ -2553,7 +2851,7 @@ treeview.check:indeterminate:disabled:backdrop {
 treeview.check:checked {
   -gtk-icon-source: -gtk-scaled(url("assets/checkbox-checked-dark.png"), url("assets/checkbox-checked-dark@2.png"));
   -gtk-icon-shadow: 0 1px 0 rgba(238, 238, 236, 0.07); }
-  treeview.check:checked button.flat, treeview.check:checked button.sidebar-button, treeview.check:checked headerbar button.titlebutton, headerbar treeview.check:checked button.titlebutton,
+  treeview.check:checked button.flat, treeview.check:checked notebook > header > tabs > arrow, treeview.check:checked button.sidebar-button, treeview.check:checked headerbar button.titlebutton, headerbar treeview.check:checked button.titlebutton,
   treeview.check:checked .titlebar button.titlebutton,
   .titlebar treeview.check:checked button.titlebutton {
     -gtk-icon-shadow: none; }
@@ -2561,7 +2859,7 @@ treeview.check:checked {
 treeview.check:checked:disabled {
   -gtk-icon-source: -gtk-scaled(url("assets/checkbox-checked-insensitive-dark.png"), url("assets/checkbox-checked-insensitive-dark@2.png"));
   -gtk-icon-shadow: 0 1px 0 rgba(238, 238, 236, 0.07); }
-  treeview.check:checked:disabled button.flat, treeview.check:checked:disabled button.sidebar-button, treeview.check:checked:disabled headerbar button.titlebutton, headerbar treeview.check:checked:disabled button.titlebutton,
+  treeview.check:checked:disabled button.flat, treeview.check:checked:disabled notebook > header > tabs > arrow, treeview.check:checked:disabled button.sidebar-button, treeview.check:checked:disabled headerbar button.titlebutton, headerbar treeview.check:checked:disabled button.titlebutton,
   treeview.check:checked:disabled .titlebar button.titlebutton,
   .titlebar treeview.check:checked:disabled button.titlebutton {
     -gtk-icon-shadow: none; }
@@ -2569,7 +2867,7 @@ treeview.check:checked:disabled {
 treeview.check:checked:hover {
   -gtk-icon-source: -gtk-scaled(url("assets/checkbox-checked-hover-dark.png"), url("assets/checkbox-checked-hover-dark@2.png"));
   -gtk-icon-shadow: 0 1px 0 rgba(238, 238, 236, 0.07); }
-  treeview.check:checked:hover button.flat, treeview.check:checked:hover button.sidebar-button, treeview.check:checked:hover headerbar button.titlebutton, headerbar treeview.check:checked:hover button.titlebutton,
+  treeview.check:checked:hover button.flat, treeview.check:checked:hover notebook > header > tabs > arrow, treeview.check:checked:hover button.sidebar-button, treeview.check:checked:hover headerbar button.titlebutton, headerbar treeview.check:checked:hover button.titlebutton,
   treeview.check:checked:hover .titlebar button.titlebutton,
   .titlebar treeview.check:checked:hover button.titlebutton {
     -gtk-icon-shadow: none; }
@@ -2577,7 +2875,7 @@ treeview.check:checked:hover {
 treeview.check:checked:active {
   -gtk-icon-source: -gtk-scaled(url("assets/checkbox-checked-active-dark.png"), url("assets/checkbox-checked-active-dark@2.png"));
   -gtk-icon-shadow: 0 1px 0 rgba(238, 238, 236, 0.07); }
-  treeview.check:checked:active button.flat, treeview.check:checked:active button.sidebar-button, treeview.check:checked:active headerbar button.titlebutton, headerbar treeview.check:checked:active button.titlebutton,
+  treeview.check:checked:active button.flat, treeview.check:checked:active notebook > header > tabs > arrow, treeview.check:checked:active button.sidebar-button, treeview.check:checked:active headerbar button.titlebutton, headerbar treeview.check:checked:active button.titlebutton,
   treeview.check:checked:active .titlebar button.titlebutton,
   .titlebar treeview.check:checked:active button.titlebutton {
     -gtk-icon-shadow: none; }
@@ -2585,7 +2883,7 @@ treeview.check:checked:active {
 treeview.check:backdrop:checked {
   -gtk-icon-source: -gtk-scaled(url("assets/checkbox-checked-backdrop-dark.png"), url("assets/checkbox-checked-backdrop-dark@2.png"));
   -gtk-icon-shadow: none; }
-  treeview.check:backdrop:checked button.flat, treeview.check:backdrop:checked button.sidebar-button, treeview.check:backdrop:checked headerbar button.titlebutton, headerbar treeview.check:backdrop:checked button.titlebutton,
+  treeview.check:backdrop:checked button.flat, treeview.check:backdrop:checked notebook > header > tabs > arrow, treeview.check:backdrop:checked button.sidebar-button, treeview.check:backdrop:checked headerbar button.titlebutton, headerbar treeview.check:backdrop:checked button.titlebutton,
   treeview.check:backdrop:checked .titlebar button.titlebutton,
   .titlebar treeview.check:backdrop:checked button.titlebutton {
     -gtk-icon-shadow: none; }
@@ -2593,7 +2891,7 @@ treeview.check:backdrop:checked {
 treeview.check:backdrop:checked:disabled {
   -gtk-icon-source: -gtk-scaled(url("assets/checkbox-checked-backdrop-insensitive-dark.png"), url("assets/checkbox-checked-backdrop-insensitive-dark@2.png"));
   -gtk-icon-shadow: none; }
-  treeview.check:backdrop:checked:disabled button.flat, treeview.check:backdrop:checked:disabled button.sidebar-button, treeview.check:backdrop:checked:disabled headerbar button.titlebutton, headerbar treeview.check:backdrop:checked:disabled button.titlebutton,
+  treeview.check:backdrop:checked:disabled button.flat, treeview.check:backdrop:checked:disabled notebook > header > tabs > arrow, treeview.check:backdrop:checked:disabled button.sidebar-button, treeview.check:backdrop:checked:disabled headerbar button.titlebutton, headerbar treeview.check:backdrop:checked:disabled button.titlebutton,
   treeview.check:backdrop:checked:disabled .titlebar button.titlebutton,
   .titlebar treeview.check:backdrop:checked:disabled button.titlebutton {
     -gtk-icon-shadow: none; }
@@ -2601,7 +2899,7 @@ treeview.check:backdrop:checked:disabled {
 treeview.radio {
   -gtk-icon-source: -gtk-scaled(url("assets/radio-unchecked-dark.png"), url("assets/radio-unchecked-dark@2.png"));
   -gtk-icon-shadow: 0 1px 0 rgba(238, 238, 236, 0.07); }
-  treeview.radio button.flat, treeview.radio button.sidebar-button, treeview.radio headerbar button.titlebutton, headerbar treeview.radio button.titlebutton,
+  treeview.radio button.flat, treeview.radio notebook > header > tabs > arrow, treeview.radio button.sidebar-button, treeview.radio headerbar button.titlebutton, headerbar treeview.radio button.titlebutton,
   treeview.radio .titlebar button.titlebutton,
   .titlebar treeview.radio button.titlebutton {
     -gtk-icon-shadow: none; }
@@ -2609,7 +2907,7 @@ treeview.radio {
 treeview.radio:hover {
   -gtk-icon-source: -gtk-scaled(url("assets/radio-unchecked-hover-dark.png"), url("assets/radio-unchecked-hover-dark@2.png"));
   -gtk-icon-shadow: 0 1px 0 rgba(238, 238, 236, 0.07); }
-  treeview.radio:hover button.flat, treeview.radio:hover button.sidebar-button, treeview.radio:hover headerbar button.titlebutton, headerbar treeview.radio:hover button.titlebutton,
+  treeview.radio:hover button.flat, treeview.radio:hover notebook > header > tabs > arrow, treeview.radio:hover button.sidebar-button, treeview.radio:hover headerbar button.titlebutton, headerbar treeview.radio:hover button.titlebutton,
   treeview.radio:hover .titlebar button.titlebutton,
   .titlebar treeview.radio:hover button.titlebutton {
     -gtk-icon-shadow: none; }
@@ -2617,7 +2915,7 @@ treeview.radio:hover {
 treeview.radio:active {
   -gtk-icon-source: -gtk-scaled(url("assets/radio-unchecked-active-dark.png"), url("assets/radio-unchecked-active-dark@2.png"));
   -gtk-icon-shadow: 0 1px 0 rgba(238, 238, 236, 0.07); }
-  treeview.radio:active button.flat, treeview.radio:active button.sidebar-button, treeview.radio:active headerbar button.titlebutton, headerbar treeview.radio:active button.titlebutton,
+  treeview.radio:active button.flat, treeview.radio:active notebook > header > tabs > arrow, treeview.radio:active button.sidebar-button, treeview.radio:active headerbar button.titlebutton, headerbar treeview.radio:active button.titlebutton,
   treeview.radio:active .titlebar button.titlebutton,
   .titlebar treeview.radio:active button.titlebutton {
     -gtk-icon-shadow: none; }
@@ -2625,7 +2923,7 @@ treeview.radio:active {
 treeview.radio:disabled {
   -gtk-icon-source: -gtk-scaled(url("assets/radio-unchecked-insensitive-dark.png"), url("assets/radio-unchecked-insensitive-dark@2.png"));
   -gtk-icon-shadow: 0 1px 0 rgba(238, 238, 236, 0.07); }
-  treeview.radio:disabled button.flat, treeview.radio:disabled button.sidebar-button, treeview.radio:disabled headerbar button.titlebutton, headerbar treeview.radio:disabled button.titlebutton,
+  treeview.radio:disabled button.flat, treeview.radio:disabled notebook > header > tabs > arrow, treeview.radio:disabled button.sidebar-button, treeview.radio:disabled headerbar button.titlebutton, headerbar treeview.radio:disabled button.titlebutton,
   treeview.radio:disabled .titlebar button.titlebutton,
   .titlebar treeview.radio:disabled button.titlebutton {
     -gtk-icon-shadow: none; }
@@ -2633,7 +2931,7 @@ treeview.radio:disabled {
 treeview.radio:backdrop {
   -gtk-icon-source: -gtk-scaled(url("assets/radio-unchecked-backdrop-dark.png"), url("assets/radio-unchecked-backdrop-dark@2.png"));
   -gtk-icon-shadow: none; }
-  treeview.radio:backdrop button.flat, treeview.radio:backdrop button.sidebar-button, treeview.radio:backdrop headerbar button.titlebutton, headerbar treeview.radio:backdrop button.titlebutton,
+  treeview.radio:backdrop button.flat, treeview.radio:backdrop notebook > header > tabs > arrow, treeview.radio:backdrop button.sidebar-button, treeview.radio:backdrop headerbar button.titlebutton, headerbar treeview.radio:backdrop button.titlebutton,
   treeview.radio:backdrop .titlebar button.titlebutton,
   .titlebar treeview.radio:backdrop button.titlebutton {
     -gtk-icon-shadow: none; }
@@ -2641,7 +2939,7 @@ treeview.radio:backdrop {
 treeview.radio:backdrop:disabled {
   -gtk-icon-source: -gtk-scaled(url("assets/radio-unchecked-backdrop-insensitive-dark.png"), url("assets/radio-unchecked-backdrop-insensitive-dark@2.png"));
   -gtk-icon-shadow: none; }
-  treeview.radio:backdrop:disabled button.flat, treeview.radio:backdrop:disabled button.sidebar-button, treeview.radio:backdrop:disabled headerbar button.titlebutton, headerbar treeview.radio:backdrop:disabled button.titlebutton,
+  treeview.radio:backdrop:disabled button.flat, treeview.radio:backdrop:disabled notebook > header > tabs > arrow, treeview.radio:backdrop:disabled button.sidebar-button, treeview.radio:backdrop:disabled headerbar button.titlebutton, headerbar treeview.radio:backdrop:disabled button.titlebutton,
   treeview.radio:backdrop:disabled .titlebar button.titlebutton,
   .titlebar treeview.radio:backdrop:disabled button.titlebutton {
     -gtk-icon-shadow: none; }
@@ -2649,7 +2947,7 @@ treeview.radio:backdrop:disabled {
 treeview.radio:indeterminate {
   -gtk-icon-source: -gtk-scaled(url("assets/radio-mixed-dark.png"), url("assets/radio-mixed-dark@2.png"));
   -gtk-icon-shadow: 0 1px 0 rgba(238, 238, 236, 0.07); }
-  treeview.radio:indeterminate button.flat, treeview.radio:indeterminate button.sidebar-button, treeview.radio:indeterminate headerbar button.titlebutton, headerbar treeview.radio:indeterminate button.titlebutton,
+  treeview.radio:indeterminate button.flat, treeview.radio:indeterminate notebook > header > tabs > arrow, treeview.radio:indeterminate button.sidebar-button, treeview.radio:indeterminate headerbar button.titlebutton, headerbar treeview.radio:indeterminate button.titlebutton,
   treeview.radio:indeterminate .titlebar button.titlebutton,
   .titlebar treeview.radio:indeterminate button.titlebutton {
     -gtk-icon-shadow: none; }
@@ -2657,7 +2955,7 @@ treeview.radio:indeterminate {
 treeview.radio:indeterminate:hover {
   -gtk-icon-source: -gtk-scaled(url("assets/radio-mixed-hover-dark.png"), url("assets/radio-mixed-hover-dark@2.png"));
   -gtk-icon-shadow: 0 1px 0 rgba(238, 238, 236, 0.07); }
-  treeview.radio:indeterminate:hover button.flat, treeview.radio:indeterminate:hover button.sidebar-button, treeview.radio:indeterminate:hover headerbar button.titlebutton, headerbar treeview.radio:indeterminate:hover button.titlebutton,
+  treeview.radio:indeterminate:hover button.flat, treeview.radio:indeterminate:hover notebook > header > tabs > arrow, treeview.radio:indeterminate:hover button.sidebar-button, treeview.radio:indeterminate:hover headerbar button.titlebutton, headerbar treeview.radio:indeterminate:hover button.titlebutton,
   treeview.radio:indeterminate:hover .titlebar button.titlebutton,
   .titlebar treeview.radio:indeterminate:hover button.titlebutton {
     -gtk-icon-shadow: none; }
@@ -2665,7 +2963,7 @@ treeview.radio:indeterminate:hover {
 treeview.radio:indeterminate:selected {
   -gtk-icon-source: -gtk-scaled(url("assets/radio-mixed-active-dark.png"), url("assets/radio-mixed-active-dark@2.png"));
   -gtk-icon-shadow: 0 1px 0 rgba(238, 238, 236, 0.07); }
-  treeview.radio:indeterminate:selected button.flat, treeview.radio:indeterminate:selected button.sidebar-button, treeview.radio:indeterminate:selected headerbar button.titlebutton, headerbar treeview.radio:indeterminate:selected button.titlebutton,
+  treeview.radio:indeterminate:selected button.flat, treeview.radio:indeterminate:selected notebook > header > tabs > arrow, treeview.radio:indeterminate:selected button.sidebar-button, treeview.radio:indeterminate:selected headerbar button.titlebutton, headerbar treeview.radio:indeterminate:selected button.titlebutton,
   treeview.radio:indeterminate:selected .titlebar button.titlebutton,
   .titlebar treeview.radio:indeterminate:selected button.titlebutton {
     -gtk-icon-shadow: none; }
@@ -2673,7 +2971,7 @@ treeview.radio:indeterminate:selected {
 treeview.radio:indeterminate:backdrop {
   -gtk-icon-source: -gtk-scaled(url("assets/radio-mixed-backdrop-dark.png"), url("assets/radio-mixed-backdrop-dark@2.png"));
   -gtk-icon-shadow: none; }
-  treeview.radio:indeterminate:backdrop button.flat, treeview.radio:indeterminate:backdrop button.sidebar-button, treeview.radio:indeterminate:backdrop headerbar button.titlebutton, headerbar treeview.radio:indeterminate:backdrop button.titlebutton,
+  treeview.radio:indeterminate:backdrop button.flat, treeview.radio:indeterminate:backdrop notebook > header > tabs > arrow, treeview.radio:indeterminate:backdrop button.sidebar-button, treeview.radio:indeterminate:backdrop headerbar button.titlebutton, headerbar treeview.radio:indeterminate:backdrop button.titlebutton,
   treeview.radio:indeterminate:backdrop .titlebar button.titlebutton,
   .titlebar treeview.radio:indeterminate:backdrop button.titlebutton {
     -gtk-icon-shadow: none; }
@@ -2681,7 +2979,7 @@ treeview.radio:indeterminate:backdrop {
 treeview.radio:indeterminate:disabled {
   -gtk-icon-source: -gtk-scaled(url("assets/radio-mixed-insensitive-dark.png"), url("assets/radio-mixed-insensitive-dark@2.png"));
   -gtk-icon-shadow: 0 1px 0 rgba(238, 238, 236, 0.07); }
-  treeview.radio:indeterminate:disabled button.flat, treeview.radio:indeterminate:disabled button.sidebar-button, treeview.radio:indeterminate:disabled headerbar button.titlebutton, headerbar treeview.radio:indeterminate:disabled button.titlebutton,
+  treeview.radio:indeterminate:disabled button.flat, treeview.radio:indeterminate:disabled notebook > header > tabs > arrow, treeview.radio:indeterminate:disabled button.sidebar-button, treeview.radio:indeterminate:disabled headerbar button.titlebutton, headerbar treeview.radio:indeterminate:disabled button.titlebutton,
   treeview.radio:indeterminate:disabled .titlebar button.titlebutton,
   .titlebar treeview.radio:indeterminate:disabled button.titlebutton {
     -gtk-icon-shadow: none; }
@@ -2689,7 +2987,7 @@ treeview.radio:indeterminate:disabled {
 treeview.radio:indeterminate:disabled:backdrop {
   -gtk-icon-source: -gtk-scaled(url("assets/radio-mixed-backdrop-insensitive-dark.png"), url("assets/radio-mixed-backdrop-insensitive-dark@2.png"));
   -gtk-icon-shadow: none; }
-  treeview.radio:indeterminate:disabled:backdrop button.flat, treeview.radio:indeterminate:disabled:backdrop button.sidebar-button, treeview.radio:indeterminate:disabled:backdrop headerbar button.titlebutton, headerbar treeview.radio:indeterminate:disabled:backdrop button.titlebutton,
+  treeview.radio:indeterminate:disabled:backdrop button.flat, treeview.radio:indeterminate:disabled:backdrop notebook > header > tabs > arrow, treeview.radio:indeterminate:disabled:backdrop button.sidebar-button, treeview.radio:indeterminate:disabled:backdrop headerbar button.titlebutton, headerbar treeview.radio:indeterminate:disabled:backdrop button.titlebutton,
   treeview.radio:indeterminate:disabled:backdrop .titlebar button.titlebutton,
   .titlebar treeview.radio:indeterminate:disabled:backdrop button.titlebutton {
     -gtk-icon-shadow: none; }
@@ -2697,7 +2995,7 @@ treeview.radio:indeterminate:disabled:backdrop {
 treeview.radio:checked {
   -gtk-icon-source: -gtk-scaled(url("assets/radio-checked-dark.png"), url("assets/radio-checked-dark@2.png"));
   -gtk-icon-shadow: 0 1px 0 rgba(238, 238, 236, 0.07); }
-  treeview.radio:checked button.flat, treeview.radio:checked button.sidebar-button, treeview.radio:checked headerbar button.titlebutton, headerbar treeview.radio:checked button.titlebutton,
+  treeview.radio:checked button.flat, treeview.radio:checked notebook > header > tabs > arrow, treeview.radio:checked button.sidebar-button, treeview.radio:checked headerbar button.titlebutton, headerbar treeview.radio:checked button.titlebutton,
   treeview.radio:checked .titlebar button.titlebutton,
   .titlebar treeview.radio:checked button.titlebutton {
     -gtk-icon-shadow: none; }
@@ -2705,7 +3003,7 @@ treeview.radio:checked {
 treeview.radio:checked:disabled {
   -gtk-icon-source: -gtk-scaled(url("assets/radio-checked-insensitive-dark.png"), url("assets/radio-checked-insensitive-dark@2.png"));
   -gtk-icon-shadow: 0 1px 0 rgba(238, 238, 236, 0.07); }
-  treeview.radio:checked:disabled button.flat, treeview.radio:checked:disabled button.sidebar-button, treeview.radio:checked:disabled headerbar button.titlebutton, headerbar treeview.radio:checked:disabled button.titlebutton,
+  treeview.radio:checked:disabled button.flat, treeview.radio:checked:disabled notebook > header > tabs > arrow, treeview.radio:checked:disabled button.sidebar-button, treeview.radio:checked:disabled headerbar button.titlebutton, headerbar treeview.radio:checked:disabled button.titlebutton,
   treeview.radio:checked:disabled .titlebar button.titlebutton,
   .titlebar treeview.radio:checked:disabled button.titlebutton {
     -gtk-icon-shadow: none; }
@@ -2713,7 +3011,7 @@ treeview.radio:checked:disabled {
 treeview.radio:checked:hover {
   -gtk-icon-source: -gtk-scaled(url("assets/radio-checked-hover-dark.png"), url("assets/radio-checked-hover-dark@2.png"));
   -gtk-icon-shadow: 0 1px 0 rgba(238, 238, 236, 0.07); }
-  treeview.radio:checked:hover button.flat, treeview.radio:checked:hover button.sidebar-button, treeview.radio:checked:hover headerbar button.titlebutton, headerbar treeview.radio:checked:hover button.titlebutton,
+  treeview.radio:checked:hover button.flat, treeview.radio:checked:hover notebook > header > tabs > arrow, treeview.radio:checked:hover button.sidebar-button, treeview.radio:checked:hover headerbar button.titlebutton, headerbar treeview.radio:checked:hover button.titlebutton,
   treeview.radio:checked:hover .titlebar button.titlebutton,
   .titlebar treeview.radio:checked:hover button.titlebutton {
     -gtk-icon-shadow: none; }
@@ -2721,7 +3019,7 @@ treeview.radio:checked:hover {
 treeview.radio:checked:active {
   -gtk-icon-source: -gtk-scaled(url("assets/radio-checked-active-dark.png"), url("assets/radio-checked-active-dark@2.png"));
   -gtk-icon-shadow: 0 1px 0 rgba(238, 238, 236, 0.07); }
-  treeview.radio:checked:active button.flat, treeview.radio:checked:active button.sidebar-button, treeview.radio:checked:active headerbar button.titlebutton, headerbar treeview.radio:checked:active button.titlebutton,
+  treeview.radio:checked:active button.flat, treeview.radio:checked:active notebook > header > tabs > arrow, treeview.radio:checked:active button.sidebar-button, treeview.radio:checked:active headerbar button.titlebutton, headerbar treeview.radio:checked:active button.titlebutton,
   treeview.radio:checked:active .titlebar button.titlebutton,
   .titlebar treeview.radio:checked:active button.titlebutton {
     -gtk-icon-shadow: none; }
@@ -2729,7 +3027,7 @@ treeview.radio:checked:active {
 treeview.radio:backdrop:checked {
   -gtk-icon-source: -gtk-scaled(url("assets/radio-checked-backdrop-dark.png"), url("assets/radio-checked-backdrop-dark@2.png"));
   -gtk-icon-shadow: none; }
-  treeview.radio:backdrop:checked button.flat, treeview.radio:backdrop:checked button.sidebar-button, treeview.radio:backdrop:checked headerbar button.titlebutton, headerbar treeview.radio:backdrop:checked button.titlebutton,
+  treeview.radio:backdrop:checked button.flat, treeview.radio:backdrop:checked notebook > header > tabs > arrow, treeview.radio:backdrop:checked button.sidebar-button, treeview.radio:backdrop:checked headerbar button.titlebutton, headerbar treeview.radio:backdrop:checked button.titlebutton,
   treeview.radio:backdrop:checked .titlebar button.titlebutton,
   .titlebar treeview.radio:backdrop:checked button.titlebutton {
     -gtk-icon-shadow: none; }
@@ -2737,7 +3035,7 @@ treeview.radio:backdrop:checked {
 treeview.radio:backdrop:checked:disabled {
   -gtk-icon-source: -gtk-scaled(url("assets/radio-checked-backdrop-insensitive-dark.png"), url("assets/radio-checked-backdrop-insensitive-dark@2.png"));
   -gtk-icon-shadow: none; }
-  treeview.radio:backdrop:checked:disabled button.flat, treeview.radio:backdrop:checked:disabled button.sidebar-button, treeview.radio:backdrop:checked:disabled headerbar button.titlebutton, headerbar treeview.radio:backdrop:checked:disabled button.titlebutton,
+  treeview.radio:backdrop:checked:disabled button.flat, treeview.radio:backdrop:checked:disabled notebook > header > tabs > arrow, treeview.radio:backdrop:checked:disabled button.sidebar-button, treeview.radio:backdrop:checked:disabled headerbar button.titlebutton, headerbar treeview.radio:backdrop:checked:disabled button.titlebutton,
   treeview.radio:backdrop:checked:disabled .titlebar button.titlebutton,
   .titlebar treeview.radio:backdrop:checked:disabled button.titlebutton {
     -gtk-icon-shadow: none; }
@@ -3629,7 +3927,7 @@ row:selected .titlebar button.titlebutton,
   text-shadow: 0 -1px rgba(0, 0, 0, 0.81176);
   -gtk-icon-shadow: 0 -1px rgba(0, 0, 0, 0.81176);
   box-shadow: inset 0 1px rgba(255, 255, 255, 0.05); }
-  row:selected button.flat, row:selected button.sidebar-button, row:selected headerbar button.titlebutton, headerbar row:selected button.titlebutton,
+  row:selected button.flat, row:selected notebook > header > tabs > arrow, row:selected button.sidebar-button, row:selected headerbar button.titlebutton, headerbar row:selected button.titlebutton,
   row:selected .titlebar button.titlebutton,
   .titlebar row:selected button.titlebutton {
     border-color: transparent;
@@ -3661,7 +3959,7 @@ row:selected .titlebar button.titlebutton,
     text-shadow: 0 -1px rgba(0, 0, 0, 0.89176);
     -gtk-icon-shadow: 0 -1px rgba(0, 0, 0, 0.89176);
     box-shadow: inset 0 2px 1px -2px rgba(0, 0, 0, 0.6); }
-  row:selected button:backdrop, row:selected button.flat:backdrop, row:selected button.sidebar-button:backdrop, row:selected headerbar button.titlebutton:backdrop, headerbar row:selected button.titlebutton:backdrop,
+  row:selected button:backdrop, row:selected button.flat:backdrop, row:selected notebook > header > tabs > arrow:backdrop, row:selected button.sidebar-button:backdrop, row:selected headerbar button.titlebutton:backdrop, headerbar row:selected button.titlebutton:backdrop,
   row:selected .titlebar button.titlebutton:backdrop,
   .titlebar row:selected button.titlebutton:backdrop {
     color: #949796;
@@ -3670,16 +3968,16 @@ row:selected .titlebar button.titlebutton,
     text-shadow: none;
     -gtk-icon-shadow: none;
     box-shadow: inset 0 1px rgba(255, 255, 255, 0); }
-    row:selected button:backdrop:active, row:selected button:backdrop:checked, row:selected button.flat:backdrop:active, row:selected button.sidebar-button:backdrop:active, row:selected headerbar button.titlebutton:backdrop:active, headerbar row:selected button.titlebutton:backdrop:active,
+    row:selected button:backdrop:active, row:selected button:backdrop:checked, row:selected button.flat:backdrop:active, row:selected notebook > header > tabs > arrow:backdrop:active, row:selected button.sidebar-button:backdrop:active, row:selected headerbar button.titlebutton:backdrop:active, headerbar row:selected button.titlebutton:backdrop:active,
     row:selected .titlebar button.titlebutton:backdrop:active,
-    .titlebar row:selected button.titlebutton:backdrop:active, row:selected button.flat:backdrop:checked, row:selected button.sidebar-button:backdrop:checked, row:selected headerbar button.titlebutton:backdrop:checked, headerbar row:selected button.titlebutton:backdrop:checked,
+    .titlebar row:selected button.titlebutton:backdrop:active, row:selected button.flat:backdrop:checked, row:selected notebook > header > tabs > arrow:backdrop:checked, row:selected button.sidebar-button:backdrop:checked, row:selected headerbar button.titlebutton:backdrop:checked, headerbar row:selected button.titlebutton:backdrop:checked,
     row:selected .titlebar button.titlebutton:backdrop:checked,
     .titlebar row:selected button.titlebutton:backdrop:checked {
       color: #949796;
       border-color: #1f2222;
       background-image: linear-gradient(to bottom, #303535);
       box-shadow: inset 0 1px rgba(255, 255, 255, 0); }
-    row:selected button:backdrop:disabled, row:selected button.flat:backdrop:disabled, row:selected button.sidebar-button:backdrop:disabled, row:selected headerbar button.titlebutton:backdrop:disabled, headerbar row:selected button.titlebutton:backdrop:disabled,
+    row:selected button:backdrop:disabled, row:selected button.flat:backdrop:disabled, row:selected notebook > header > tabs > arrow:backdrop:disabled, row:selected button.sidebar-button:backdrop:disabled, row:selected headerbar button.titlebutton:backdrop:disabled, headerbar row:selected button.titlebutton:backdrop:disabled,
     row:selected .titlebar button.titlebutton:backdrop:disabled,
     .titlebar row:selected button.titlebutton:backdrop:disabled {
       color: #5d6767;
@@ -3688,16 +3986,16 @@ row:selected .titlebar button.titlebutton,
       text-shadow: none;
       -gtk-icon-shadow: none;
       box-shadow: inset 0 1px rgba(255, 255, 255, 0); }
-      row:selected button:backdrop:disabled:active, row:selected button:backdrop:disabled:checked, row:selected button.flat:backdrop:disabled:active, row:selected button.sidebar-button:backdrop:disabled:active, row:selected headerbar button.titlebutton:backdrop:disabled:active, headerbar row:selected button.titlebutton:backdrop:disabled:active,
+      row:selected button:backdrop:disabled:active, row:selected button:backdrop:disabled:checked, row:selected button.flat:backdrop:disabled:active, row:selected notebook > header > tabs > arrow:backdrop:disabled:active, row:selected button.sidebar-button:backdrop:disabled:active, row:selected headerbar button.titlebutton:backdrop:disabled:active, headerbar row:selected button.titlebutton:backdrop:disabled:active,
       row:selected .titlebar button.titlebutton:backdrop:disabled:active,
-      .titlebar row:selected button.titlebutton:backdrop:disabled:active, row:selected button.flat:backdrop:disabled:checked, row:selected button.sidebar-button:backdrop:disabled:checked, row:selected headerbar button.titlebutton:backdrop:disabled:checked, headerbar row:selected button.titlebutton:backdrop:disabled:checked,
+      .titlebar row:selected button.titlebutton:backdrop:disabled:active, row:selected button.flat:backdrop:disabled:checked, row:selected notebook > header > tabs > arrow:backdrop:disabled:checked, row:selected button.sidebar-button:backdrop:disabled:checked, row:selected headerbar button.titlebutton:backdrop:disabled:checked, headerbar row:selected button.titlebutton:backdrop:disabled:checked,
       row:selected .titlebar button.titlebutton:backdrop:disabled:checked,
       .titlebar row:selected button.titlebutton:backdrop:disabled:checked {
         color: #5d6767;
         border-color: #1f2222;
         background-image: linear-gradient(to bottom, #272929);
         box-shadow: inset 0 1px rgba(255, 255, 255, 0); }
-  row:selected button.flat:backdrop, row:selected button.sidebar-button:backdrop, row:selected headerbar button.titlebutton:backdrop, headerbar row:selected button.titlebutton:backdrop,
+  row:selected button.flat:backdrop, row:selected notebook > header > tabs > arrow:backdrop, row:selected button.sidebar-button:backdrop, row:selected headerbar button.titlebutton:backdrop, headerbar row:selected button.titlebutton:backdrop,
   row:selected .titlebar button.titlebutton:backdrop,
   .titlebar row:selected button.titlebutton:backdrop {
     border-color: transparent;
@@ -4314,7 +4612,7 @@ colorswatch#editor-color-sample {
   .content-view:backdrop {
     background-color: #282c2c; }
 
-.osd .scale-popup button.flat, .osd .scale-popup button.sidebar-button, .osd .scale-popup headerbar button.titlebutton, headerbar .osd .scale-popup button.titlebutton,
+.osd .scale-popup button.flat, .osd .scale-popup notebook > header > tabs > arrow, .osd .scale-popup button.sidebar-button, .osd .scale-popup headerbar button.titlebutton, headerbar .osd .scale-popup button.titlebutton,
 .osd .scale-popup .titlebar button.titlebutton,
 .titlebar .osd .scale-popup button.titlebutton {
   padding: 6px;

diff --git a/gtk/theme/Adwaita/gtk-contained.css b/gtk/theme/Adwaita/gtk-contained.css
index 67eb29239e7abbc8a4413af6f9aca74dc92495dd..f9d22f21299708104fcb4e05dac0bbe3f8f4c7ba 100644 (file)
--- a/gtk/theme/Adwaita/gtk-contained.css
+++ b/gtk/theme/Adwaita/gtk-contained.css
@@ -346,7 +346,9 @@ entry, spinbutton:not(.vertical) {
     background-image: -gtk-gradient(radial, center center, 0, center center, 0.01, to(#4a90d9), to(transparent)); }
   to {
     background-image: -gtk-gradient(radial, center center, 0, center center, 0.5, to(#4a90d9), to(transparent)); } }
-button, headerbar button.titlebutton,
+notebook > header > tabs > arrow,
+button,
+headerbar button.titlebutton,
 .titlebar button.titlebutton {
   min-height: 24px;
   min-width: 16px;
@@ -361,7 +363,11 @@ button, headerbar button.titlebutton,
   text-shadow: 0 1px rgba(255, 255, 255, 0.76923);
   -gtk-icon-shadow: 0 1px rgba(255, 255, 255, 0.76923);
   box-shadow: inset 0 1px rgba(255, 255, 255, 0.8), 0 1px rgba(255, 255, 255, 0); }
-  button.flat, button.sidebar-button, headerbar button.titlebutton,
+  notebook > header > tabs > arrow.flat,
+  button.flat,
+  notebook > header > tabs > arrow,
+  button.sidebar-button,
+  headerbar button.titlebutton,
   .titlebar button.titlebutton {
     border-color: transparent;
     background-color: transparent;
@@ -370,14 +376,24 @@ button, headerbar button.titlebutton,
     text-shadow: none;
     -gtk-icon-shadow: none;
     transition: none; }
-    button.flat:hover, button.sidebar-button:hover, headerbar button.titlebutton:hover,
+    notebook > header > tabs > arrow.flat:hover,
+    button.flat:hover,
+    notebook > header > tabs > arrow:hover,
+    button.sidebar-button:hover,
+    headerbar button.titlebutton:hover,
     .titlebar button.titlebutton:hover {
       transition: all 200ms cubic-bezier(0.25, 0.46, 0.45, 0.94);
       transition-duration: 500ms; }
-      button.flat:hover:active, button.sidebar-button:hover:active, headerbar button.titlebutton:hover:active,
+      notebook > header > tabs > arrow.flat:hover:active,
+      button.flat:hover:active,
+      notebook > header > tabs > arrow:hover:active,
+      button.sidebar-button:hover:active,
+      headerbar button.titlebutton:hover:active,
       .titlebar button.titlebutton:hover:active {
         transition: all 200ms cubic-bezier(0.25, 0.46, 0.45, 0.94); }
-  button:hover, headerbar button.titlebutton:hover,
+  notebook > header > tabs > arrow:hover,
+  button:hover,
+  headerbar button.titlebutton:hover,
   .titlebar button.titlebutton:hover {
     color: #2e3436;
     outline-color: rgba(46, 52, 54, 0.3);
@@ -393,8 +409,12 @@ button, headerbar button.titlebutton,
     -gtk-icon-shadow: 0 1px rgba(255, 255, 255, 0.76923);
     box-shadow: inset 0 1px white, 0 1px rgba(255, 255, 255, 0);
     -gtk-icon-effect: highlight; }
-  button:active, headerbar button.titlebutton:active,
-  .titlebar button.titlebutton:active, button:checked, headerbar button.titlebutton:checked,
+  notebook > header > tabs > arrow:active, notebook > header > tabs > arrow:checked,
+  button:active,
+  headerbar button.titlebutton:active,
+  .titlebar button.titlebutton:active,
+  button:checked,
+  headerbar button.titlebutton:checked,
   .titlebar button.titlebutton:checked {
     color: #2e3436;
     outline-color: rgba(46, 52, 54, 0.3);
@@ -404,8 +424,14 @@ button, headerbar button.titlebutton,
     -gtk-icon-shadow: 0 1px rgba(255, 255, 255, 0.76923);
     box-shadow: inset 0 2px 1px -2px rgba(0, 0, 0, 0.6), 0 1px rgba(255, 255, 255, 0);
     transition-duration: 50ms; }
-  button:backdrop, headerbar button.titlebutton:backdrop,
-  .titlebar button.titlebutton:backdrop, button.flat:backdrop, button.sidebar-button:backdrop, headerbar button.titlebutton:backdrop,
+  notebook > header > tabs > arrow:backdrop, notebook > header > tabs > arrow.flat:backdrop,
+  button:backdrop,
+  headerbar button.titlebutton:backdrop,
+  .titlebar button.titlebutton:backdrop,
+  button.flat:backdrop,
+  notebook > header > tabs > arrow:backdrop,
+  button.sidebar-button:backdrop,
+  headerbar button.titlebutton:backdrop,
   .titlebar button.titlebutton:backdrop {
     color: #8b8e8f;
     border-color: #a5a5a1;
@@ -414,14 +440,29 @@ button, headerbar button.titlebutton,
     -gtk-icon-shadow: none;
     box-shadow: inset 0 1px rgba(255, 255, 255, 0), 0 1px rgba(255, 255, 255, 0);
     -gtk-icon-effect: none; }
-    button:backdrop:active, button:backdrop:checked, button.flat:backdrop:active, button.sidebar-button:backdrop:active, headerbar button.titlebutton:backdrop:active,
-    .titlebar button.titlebutton:backdrop:active, button.flat:backdrop:checked, button.sidebar-button:backdrop:checked, headerbar button.titlebutton:backdrop:checked,
+    notebook > header > tabs > arrow:backdrop:active, notebook > header > tabs > arrow:backdrop:checked, notebook > header > tabs > arrow.flat:backdrop:active, notebook > header > tabs > arrow.flat:backdrop:checked,
+    button:backdrop:active,
+    button:backdrop:checked,
+    button.flat:backdrop:active,
+    notebook > header > tabs > arrow:backdrop:active,
+    button.sidebar-button:backdrop:active,
+    headerbar button.titlebutton:backdrop:active,
+    .titlebar button.titlebutton:backdrop:active,
+    button.flat:backdrop:checked,
+    notebook > header > tabs > arrow:backdrop:checked,
+    button.sidebar-button:backdrop:checked,
+    headerbar button.titlebutton:backdrop:checked,
     .titlebar button.titlebutton:backdrop:checked {
       color: #8b8e8f;
       border-color: #a5a5a1;
       background-image: linear-gradient(to bottom, #d1d1cf);
       box-shadow: inset 0 1px rgba(255, 255, 255, 0), 0 1px rgba(255, 255, 255, 0); }
-    button:backdrop:disabled, button.flat:backdrop:disabled, button.sidebar-button:backdrop:disabled, headerbar button.titlebutton:backdrop:disabled,
+    notebook > header > tabs > arrow:backdrop:disabled, notebook > header > tabs > arrow.flat:backdrop:disabled,
+    button:backdrop:disabled,
+    button.flat:backdrop:disabled,
+    notebook > header > tabs > arrow:backdrop:disabled,
+    button.sidebar-button:backdrop:disabled,
+    headerbar button.titlebutton:backdrop:disabled,
     .titlebar button.titlebutton:backdrop:disabled {
       color: #c3c3c0;
       border-color: #a5a5a1;
@@ -429,16 +470,38 @@ button, headerbar button.titlebutton,
       text-shadow: none;
       -gtk-icon-shadow: none;
       box-shadow: inset 0 1px rgba(255, 255, 255, 0), 0 1px rgba(255, 255, 255, 0); }
-    button:backdrop:disabled:active, button:backdrop:disabled:checked, button.flat:backdrop:disabled:active, button.sidebar-button:backdrop:disabled:active, headerbar button.titlebutton:backdrop:disabled:active,
-    .titlebar button.titlebutton:backdrop:disabled:active, button.flat:backdrop:disabled:checked, button.sidebar-button:backdrop:disabled:checked, headerbar button.titlebutton:backdrop:disabled:checked,
+    notebook > header > tabs > arrow:backdrop:disabled:active, notebook > header > tabs > arrow:backdrop:disabled:checked, notebook > header > tabs > arrow.flat:backdrop:disabled:active, notebook > header > tabs > arrow.flat:backdrop:disabled:checked,
+    button:backdrop:disabled:active,
+    button:backdrop:disabled:checked,
+    button.flat:backdrop:disabled:active,
+    notebook > header > tabs > arrow:backdrop:disabled:active,
+    button.sidebar-button:backdrop:disabled:active,
+    headerbar button.titlebutton:backdrop:disabled:active,
+    .titlebar button.titlebutton:backdrop:disabled:active,
+    button.flat:backdrop:disabled:checked,
+    notebook > header > tabs > arrow:backdrop:disabled:checked,
+    button.sidebar-button:backdrop:disabled:checked,
+    headerbar button.titlebutton:backdrop:disabled:checked,
     .titlebar button.titlebutton:backdrop:disabled:checked {
       color: #c3c3c0;
       border-color: #a5a5a1;
       background-image: linear-gradient(to bottom, #e4e4e4);
       box-shadow: inset 0 1px rgba(255, 255, 255, 0), 0 1px rgba(255, 255, 255, 0); }
-  button.flat:backdrop, button.sidebar-button:backdrop, headerbar button.titlebutton:backdrop,
-  .titlebar button.titlebutton:backdrop, button.flat:disabled, button.sidebar-button:disabled, headerbar button.titlebutton:disabled,
-  .titlebar button.titlebutton:disabled, button.flat:backdrop:disabled, button.sidebar-button:backdrop:disabled, headerbar button.titlebutton:backdrop:disabled,
+  notebook > header > tabs > arrow.flat:backdrop, notebook > header > tabs > arrow.flat:disabled, notebook > header > tabs > arrow.flat:backdrop:disabled,
+  button.flat:backdrop,
+  notebook > header > tabs > arrow:backdrop,
+  button.sidebar-button:backdrop,
+  headerbar button.titlebutton:backdrop,
+  .titlebar button.titlebutton:backdrop,
+  button.flat:disabled,
+  notebook > header > tabs > arrow:disabled,
+  button.sidebar-button:disabled,
+  headerbar button.titlebutton:disabled,
+  .titlebar button.titlebutton:disabled,
+  button.flat:backdrop:disabled,
+  notebook > header > tabs > arrow:backdrop:disabled,
+  button.sidebar-button:backdrop:disabled,
+  headerbar button.titlebutton:backdrop:disabled,
   .titlebar button.titlebutton:backdrop:disabled {
     border-color: transparent;
     background-color: transparent;
@@ -446,7 +509,9 @@ button, headerbar button.titlebutton,
     box-shadow: inset 0 1px rgba(255, 255, 255, 0), 0 1px rgba(255, 255, 255, 0);
     text-shadow: none;
     -gtk-icon-shadow: none; }
-  button:disabled, headerbar button.titlebutton:disabled,
+  notebook > header > tabs > arrow:disabled,
+  button:disabled,
+  headerbar button.titlebutton:disabled,
   .titlebar button.titlebutton:disabled {
     color: #8b8e8f;
     border-color: #9d9d99;
@@ -454,12 +519,16 @@ button, headerbar button.titlebutton,
     text-shadow: none;
     -gtk-icon-shadow: none;
     box-shadow: inset 0 1px rgba(255, 255, 255, 0), 0 1px rgba(255, 255, 255, 0); }
-    button:disabled:active, button:disabled:checked {
+    notebook > header > tabs > arrow:disabled:active, notebook > header > tabs > arrow:disabled:checked,
+    button:disabled:active,
+    button:disabled:checked {
       color: #8b8e8f;
       border-color: #9d9d99;
       background-image: linear-gradient(to bottom, #e9e9e8, #f1f1f1);
       box-shadow: inset 0 1px rgba(255, 255, 255, 0), 0 1px rgba(255, 255, 255, 0); }
-  button.osd, headerbar button.osd.titlebutton,
+  notebook > header > tabs > arrow.osd,
+  button.osd,
+  headerbar button.osd.titlebutton,
   .titlebar button.osd.titlebutton {
     color: #eeeeec;
     border-radius: 5px;
@@ -474,9 +543,11 @@ button, headerbar button.titlebutton,
     outline-color: rgba(238, 238, 236, 0.3);
     border: none;
     box-shadow: none; }
+    notebook > header > tabs > arrow.osd.image-button,
     button.osd.image-button {
       min-height: 48px;
       min-width: 48px; }
+    notebook > header > tabs > arrow.osd:hover,
     button.osd:hover {
       color: white;
       border-color: rgba(0, 0, 0, 0.7);
@@ -488,7 +559,9 @@ button, headerbar button.titlebutton,
       outline-color: rgba(238, 238, 236, 0.3);
       border: none;
       box-shadow: none; }
-    button.osd:active, button.osd:checked {
+    notebook > header > tabs > arrow.osd:active, notebook > header > tabs > arrow.osd:checked,
+    button.osd:active,
+    button.osd:checked {
       color: white;
       border-color: rgba(0, 0, 0, 0.7);
       background-image: linear-gradient(to bottom, rgba(0, 0, 0, 0.7));
@@ -499,7 +572,9 @@ button, headerbar button.titlebutton,
       outline-color: rgba(238, 238, 236, 0.3);
       border: none;
       box-shadow: none; }
-    button.osd:disabled, button.osd:backdrop:disabled {
+    notebook > header > tabs > arrow.osd:disabled, notebook > header > tabs > arrow.osd:backdrop:disabled,
+    button.osd:disabled,
+    button.osd:backdrop:disabled {
       color: #878a89;
       border-color: rgba(0, 0, 0, 0.7);
       background-image: linear-gradient(to bottom, rgba(53, 57, 58, 0.5));
@@ -508,6 +583,7 @@ button, headerbar button.titlebutton,
       text-shadow: none;
       -gtk-icon-shadow: none;
       border: none; }
+    notebook > header > tabs > arrow.osd:backdrop,
     button.osd:backdrop {
       color: #eeeeec;
       border-color: rgba(0, 0, 0, 0.7);
@@ -520,7 +596,8 @@ button, headerbar button.titlebutton,
   popover.background.touch-selection button, popover.background.magnifier button, .csd popover.background.touch-selection button, .csd popover.background.magnifier button, .app-notification button, .app-notification headerbar button.titlebutton, headerbar .app-notification button.titlebutton,
   .app-notification .titlebar button.titlebutton,
   .titlebar .app-notification button.titlebutton,
-  .app-notification.frame button, .osd button, .osd headerbar button.titlebutton, headerbar .osd button.titlebutton,
+  .app-notification.frame button, .osd notebook > header > tabs > arrow, .osd
+  button, .osd headerbar button.titlebutton, headerbar .osd button.titlebutton,
   .osd .titlebar button.titlebutton,
   .titlebar .osd button.titlebutton {
     color: #eeeeec;
@@ -531,7 +608,8 @@ button, headerbar button.titlebutton,
     text-shadow: 0 1px black;
     -gtk-icon-shadow: 0 1px black;
     outline-color: rgba(238, 238, 236, 0.3); }
-    popover.background.touch-selection button:hover, popover.background.magnifier button:hover, .app-notification button:hover, .osd button:hover {
+    popover.background.touch-selection button:hover, popover.background.magnifier button:hover, .app-notification button:hover, .osd notebook > header > tabs > arrow:hover, .osd
+    button:hover {
       color: white;
       border-color: rgba(0, 0, 0, 0.7);
       background-image: linear-gradient(to bottom, rgba(60, 69, 71, 0.8));
@@ -540,7 +618,11 @@ button, headerbar button.titlebutton,
       text-shadow: 0 1px black;
       -gtk-icon-shadow: 0 1px black;
       outline-color: rgba(238, 238, 236, 0.3); }
-    popover.background.touch-selection button:active, popover.background.magnifier button:active, .app-notification button:active, popover.background.touch-selection button:checked, popover.background.magnifier button:checked, .app-notification button:checked, popover.background.touch-selection button:backdrop:active, popover.background.magnifier button:backdrop:active, .app-notification button:backdrop:active, popover.background.touch-selection button:backdrop:checked, popover.background.magnifier button:backdrop:checked, .app-notification button:backdrop:checked, .osd button:active, .osd button:checked, .osd button:backdrop:active, .osd button:backdrop:checked {
+    popover.background.touch-selection button:active, popover.background.magnifier button:active, .app-notification button:active, popover.background.touch-selection button:checked, popover.background.magnifier button:checked, .app-notification button:checked, popover.background.touch-selection button:backdrop:active, popover.background.magnifier button:backdrop:active, .app-notification button:backdrop:active, popover.background.touch-selection button:backdrop:checked, popover.background.magnifier button:backdrop:checked, .app-notification button:backdrop:checked, .osd notebook > header > tabs > arrow:active, .osd notebook > header > tabs > arrow:checked, .osd notebook > header > tabs > arrow:backdrop:active, .osd notebook > header > tabs > arrow:backdrop:checked, .osd
+    button:active, .osd
+    button:checked, .osd
+    button:backdrop:active, .osd
+    button:backdrop:checked {
       color: white;
       border-color: rgba(0, 0, 0, 0.7);
       background-image: linear-gradient(to bottom, rgba(0, 0, 0, 0.7));
@@ -549,7 +631,9 @@ button, headerbar button.titlebutton,
       text-shadow: none;
       -gtk-icon-shadow: none;
       outline-color: rgba(238, 238, 236, 0.3); }
-    popover.background.touch-selection button:disabled, popover.background.magnifier button:disabled, .app-notification button:disabled, popover.background.touch-selection button:backdrop:disabled, popover.background.magnifier button:backdrop:disabled, .app-notification button:backdrop:disabled, .osd button:disabled, .osd button:backdrop:disabled {
+    popover.background.touch-selection button:disabled, popover.background.magnifier button:disabled, .app-notification button:disabled, popover.background.touch-selection button:backdrop:disabled, popover.background.magnifier button:backdrop:disabled, .app-notification button:backdrop:disabled, .osd notebook > header > tabs > arrow:disabled, .osd notebook > header > tabs > arrow:backdrop:disabled, .osd
+    button:disabled, .osd
+    button:backdrop:disabled {
       color: #878a89;
       border-color: rgba(0, 0, 0, 0.7);
       background-image: linear-gradient(to bottom, rgba(53, 57, 58, 0.5));
@@ -557,7 +641,8 @@ button, headerbar button.titlebutton,
       box-shadow: none;
       text-shadow: none;
       -gtk-icon-shadow: none; }
-    popover.background.touch-selection button:backdrop, popover.background.magnifier button:backdrop, .app-notification button:backdrop, .osd button:backdrop {
+    popover.background.touch-selection button:backdrop, popover.background.magnifier button:backdrop, .app-notification button:backdrop, .osd notebook > header > tabs > arrow:backdrop, .osd
+    button:backdrop {
       color: #eeeeec;
       border-color: rgba(0, 0, 0, 0.7);
       background-image: linear-gradient(to bottom, rgba(32, 37, 38, 0.8));
@@ -565,13 +650,16 @@ button, headerbar button.titlebutton,
       box-shadow: none;
       text-shadow: none;
       -gtk-icon-shadow: none; }
-    popover.background.touch-selection button.flat, popover.background.touch-selection button.sidebar-button, popover.background.touch-selection headerbar button.titlebutton, headerbar popover.background.touch-selection button.titlebutton,
+    popover.background.touch-selection button.flat, popover.background.touch-selection notebook > header > tabs > arrow, popover.background.touch-selection button.sidebar-button, popover.background.touch-selection headerbar button.titlebutton, headerbar popover.background.touch-selection button.titlebutton,
     popover.background.touch-selection .titlebar button.titlebutton,
-    .titlebar popover.background.touch-selection button.titlebutton, popover.background.magnifier button.flat, popover.background.magnifier button.sidebar-button, popover.background.magnifier headerbar button.titlebutton, headerbar popover.background.magnifier button.titlebutton,
+    .titlebar popover.background.touch-selection button.titlebutton, popover.background.magnifier button.flat, popover.background.magnifier notebook > header > tabs > arrow, popover.background.magnifier button.sidebar-button, popover.background.magnifier headerbar button.titlebutton, headerbar popover.background.magnifier button.titlebutton,
     popover.background.magnifier .titlebar button.titlebutton,
-    .titlebar popover.background.magnifier button.titlebutton, .app-notification button.flat, .app-notification button.sidebar-button, .app-notification headerbar button.titlebutton, headerbar .app-notification button.titlebutton,
+    .titlebar popover.background.magnifier button.titlebutton, .csd popover.background.touch-selection notebook > header > tabs > arrow, .csd popover.background.magnifier notebook > header > tabs > arrow, .app-notification button.flat, .app-notification notebook > header > tabs > arrow, .app-notification button.sidebar-button, .app-notification headerbar button.titlebutton, headerbar .app-notification button.titlebutton,
     .app-notification .titlebar button.titlebutton,
-    .titlebar .app-notification button.titlebutton, .osd button.flat, .osd button.sidebar-button, .osd headerbar button.titlebutton, headerbar .osd button.titlebutton,
+    .titlebar .app-notification button.titlebutton,
+    .app-notification.frame notebook > header > tabs > arrow, .osd notebook > header > tabs > arrow.flat, .osd
+    button.flat, .osd notebook > header > tabs > arrow, .osd
+    button.sidebar-button, .osd headerbar button.titlebutton, headerbar .osd button.titlebutton,
     .osd .titlebar button.titlebutton,
     .titlebar .osd button.titlebutton {
       border-color: transparent;
@@ -583,13 +671,15 @@ button, headerbar button.titlebutton,
       box-shadow: none;
       text-shadow: 0 1px black;
       -gtk-icon-shadow: 0 1px black; }
-      popover.background.touch-selection button.flat:hover, popover.background.touch-selection button.sidebar-button:hover, popover.background.touch-selection headerbar button.titlebutton:hover, headerbar popover.background.touch-selection button.titlebutton:hover,
+      popover.background.touch-selection button.flat:hover, popover.background.touch-selection notebook > header > tabs > arrow:hover, popover.background.touch-selection button.sidebar-button:hover, popover.background.touch-selection headerbar button.titlebutton:hover, headerbar popover.background.touch-selection button.titlebutton:hover,
       popover.background.touch-selection .titlebar button.titlebutton:hover,
-      .titlebar popover.background.touch-selection button.titlebutton:hover, popover.background.magnifier button.flat:hover, popover.background.magnifier button.sidebar-button:hover, popover.background.magnifier headerbar button.titlebutton:hover, headerbar popover.background.magnifier button.titlebutton:hover,
+      .titlebar popover.background.touch-selection button.titlebutton:hover, popover.background.magnifier button.flat:hover, popover.background.magnifier notebook > header > tabs > arrow:hover, popover.background.magnifier button.sidebar-button:hover, popover.background.magnifier headerbar button.titlebutton:hover, headerbar popover.background.magnifier button.titlebutton:hover,
       popover.background.magnifier .titlebar button.titlebutton:hover,
-      .titlebar popover.background.magnifier button.titlebutton:hover, .app-notification button.flat:hover, .app-notification button.sidebar-button:hover, .app-notification headerbar button.titlebutton:hover, headerbar .app-notification button.titlebutton:hover,
+      .titlebar popover.background.magnifier button.titlebutton:hover, .app-notification button.flat:hover, .app-notification notebook > header > tabs > arrow:hover, .app-notification button.sidebar-button:hover, .app-notification headerbar button.titlebutton:hover, headerbar .app-notification button.titlebutton:hover,
       .app-notification .titlebar button.titlebutton:hover,
-      .titlebar .app-notification button.titlebutton:hover, .osd button.flat:hover, .osd button.sidebar-button:hover, .osd headerbar button.titlebutton:hover, headerbar .osd button.titlebutton:hover,
+      .titlebar .app-notification button.titlebutton:hover, .osd notebook > header > tabs > arrow.flat:hover, .osd
+      button.flat:hover, .osd notebook > header > tabs > arrow:hover, .osd
+      button.sidebar-button:hover, .osd headerbar button.titlebutton:hover, headerbar .osd button.titlebutton:hover,
       .osd .titlebar button.titlebutton:hover,
       .titlebar .osd button.titlebutton:hover {
         color: white;
@@ -600,13 +690,15 @@ button, headerbar button.titlebutton,
         text-shadow: 0 1px black;
         -gtk-icon-shadow: 0 1px black;
         outline-color: rgba(238, 238, 236, 0.3); }
-      popover.background.touch-selection button.flat:disabled, popover.background.touch-selection button.sidebar-button:disabled, popover.background.touch-selection headerbar button.titlebutton:disabled, headerbar popover.background.touch-selection button.titlebutton:disabled,
+      popover.background.touch-selection button.flat:disabled, popover.background.touch-selection notebook > header > tabs > arrow:disabled, popover.background.touch-selection button.sidebar-button:disabled, popover.background.touch-selection headerbar button.titlebutton:disabled, headerbar popover.background.touch-selection button.titlebutton:disabled,
       popover.background.touch-selection .titlebar button.titlebutton:disabled,
-      .titlebar popover.background.touch-selection button.titlebutton:disabled, popover.background.magnifier button.flat:disabled, popover.background.magnifier button.sidebar-button:disabled, popover.background.magnifier headerbar button.titlebutton:disabled, headerbar popover.background.magnifier button.titlebutton:disabled,
+      .titlebar popover.background.touch-selection button.titlebutton:disabled, popover.background.magnifier button.flat:disabled, popover.background.magnifier notebook > header > tabs > arrow:disabled, popover.background.magnifier button.sidebar-button:disabled, popover.background.magnifier headerbar button.titlebutton:disabled, headerbar popover.background.magnifier button.titlebutton:disabled,
       popover.background.magnifier .titlebar button.titlebutton:disabled,
-      .titlebar popover.background.magnifier button.titlebutton:disabled, .app-notification button.flat:disabled, .app-notification button.sidebar-button:disabled, .app-notification headerbar button.titlebutton:disabled, headerbar .app-notification button.titlebutton:disabled,
+      .titlebar popover.background.magnifier button.titlebutton:disabled, .app-notification button.flat:disabled, .app-notification notebook > header > tabs > arrow:disabled, .app-notification button.sidebar-button:disabled, .app-notification headerbar button.titlebutton:disabled, headerbar .app-notification button.titlebutton:disabled,
       .app-notification .titlebar button.titlebutton:disabled,
-      .titlebar .app-notification button.titlebutton:disabled, .osd button.flat:disabled, .osd button.sidebar-button:disabled, .osd headerbar button.titlebutton:disabled, headerbar .osd button.titlebutton:disabled,
+      .titlebar .app-notification button.titlebutton:disabled, .osd notebook > header > tabs > arrow.flat:disabled, .osd
+      button.flat:disabled, .osd notebook > header > tabs > arrow:disabled, .osd
+      button.sidebar-button:disabled, .osd headerbar button.titlebutton:disabled, headerbar .osd button.titlebutton:disabled,
       .osd .titlebar button.titlebutton:disabled,
       .titlebar .osd button.titlebutton:disabled {
         color: #878a89;
@@ -619,13 +711,15 @@ button, headerbar button.titlebutton,
         background-image: none;
         border-color: transparent;
         box-shadow: none; }
-      popover.background.touch-selection button.flat:backdrop, popover.background.touch-selection button.sidebar-button:backdrop, popover.background.touch-selection headerbar button.titlebutton:backdrop, headerbar popover.background.touch-selection button.titlebutton:backdrop,
+      popover.background.touch-selection button.flat:backdrop, popover.background.touch-selection notebook > header > tabs > arrow:backdrop, popover.background.touch-selection button.sidebar-button:backdrop, popover.background.touch-selection headerbar button.titlebutton:backdrop, headerbar popover.background.touch-selection button.titlebutton:backdrop,
       popover.background.touch-selection .titlebar button.titlebutton:backdrop,
-      .titlebar popover.background.touch-selection button.titlebutton:backdrop, popover.background.magnifier button.flat:backdrop, popover.background.magnifier button.sidebar-button:backdrop, popover.background.magnifier headerbar button.titlebutton:backdrop, headerbar popover.background.magnifier button.titlebutton:backdrop,
+      .titlebar popover.background.touch-selection button.titlebutton:backdrop, popover.background.magnifier button.flat:backdrop, popover.background.magnifier notebook > header > tabs > arrow:backdrop, popover.background.magnifier button.sidebar-button:backdrop, popover.background.magnifier headerbar button.titlebutton:backdrop, headerbar popover.background.magnifier button.titlebutton:backdrop,
       popover.background.magnifier .titlebar button.titlebutton:backdrop,
-      .titlebar popover.background.magnifier button.titlebutton:backdrop, .app-notification button.flat:backdrop, .app-notification button.sidebar-button:backdrop, .app-notification headerbar button.titlebutton:backdrop, headerbar .app-notification button.titlebutton:backdrop,
+      .titlebar popover.background.magnifier button.titlebutton:backdrop, .app-notification button.flat:backdrop, .app-notification notebook > header > tabs > arrow:backdrop, .app-notification button.sidebar-button:backdrop, .app-notification headerbar button.titlebutton:backdrop, headerbar .app-notification button.titlebutton:backdrop,
       .app-notification .titlebar button.titlebutton:backdrop,
-      .titlebar .app-notification button.titlebutton:backdrop, .osd button.flat:backdrop, .osd button.sidebar-button:backdrop, .osd headerbar button.titlebutton:backdrop, headerbar .osd button.titlebutton:backdrop,
+      .titlebar .app-notification button.titlebutton:backdrop, .osd notebook > header > tabs > arrow.flat:backdrop, .osd
+      button.flat:backdrop, .osd notebook > header > tabs > arrow:backdrop, .osd
+      button.sidebar-button:backdrop, .osd headerbar button.titlebutton:backdrop, headerbar .osd button.titlebutton:backdrop,
       .osd .titlebar button.titlebutton:backdrop,
       .titlebar .osd button.titlebutton:backdrop {
         border-color: transparent;
@@ -634,21 +728,25 @@ button, headerbar button.titlebutton,
         box-shadow: inset 0 1px rgba(255, 255, 255, 0), 0 1px rgba(255, 255, 255, 0);
         text-shadow: none;
         -gtk-icon-shadow: none; }
-      popover.background.touch-selection button.flat:active, popover.background.touch-selection button.sidebar-button:active, popover.background.touch-selection headerbar button.titlebutton:active, headerbar popover.background.touch-selection button.titlebutton:active,
+      popover.background.touch-selection button.flat:active, popover.background.touch-selection notebook > header > tabs > arrow:active, popover.background.touch-selection button.sidebar-button:active, popover.background.touch-selection headerbar button.titlebutton:active, headerbar popover.background.touch-selection button.titlebutton:active,
       popover.background.touch-selection .titlebar button.titlebutton:active,
-      .titlebar popover.background.touch-selection button.titlebutton:active, popover.background.magnifier button.flat:active, popover.background.magnifier button.sidebar-button:active, popover.background.magnifier headerbar button.titlebutton:active, headerbar popover.background.magnifier button.titlebutton:active,
+      .titlebar popover.background.touch-selection button.titlebutton:active, popover.background.magnifier button.flat:active, popover.background.magnifier notebook > header > tabs > arrow:active, popover.background.magnifier button.sidebar-button:active, popover.background.magnifier headerbar button.titlebutton:active, headerbar popover.background.magnifier button.titlebutton:active,
       popover.background.magnifier .titlebar button.titlebutton:active,
-      .titlebar popover.background.magnifier button.titlebutton:active, .app-notification button.flat:active, .app-notification button.sidebar-button:active, .app-notification headerbar button.titlebutton:active, headerbar .app-notification button.titlebutton:active,
+      .titlebar popover.background.magnifier button.titlebutton:active, .app-notification button.flat:active, .app-notification notebook > header > tabs > arrow:active, .app-notification button.sidebar-button:active, .app-notification headerbar button.titlebutton:active, headerbar .app-notification button.titlebutton:active,
       .app-notification .titlebar button.titlebutton:active,
-      .titlebar .app-notification button.titlebutton:active, popover.background.touch-selection button.flat:checked, popover.background.touch-selection button.sidebar-button:checked, popover.background.touch-selection headerbar button.titlebutton:checked, headerbar popover.background.touch-selection button.titlebutton:checked,
+      .titlebar .app-notification button.titlebutton:active, popover.background.touch-selection button.flat:checked, popover.background.touch-selection notebook > header > tabs > arrow:checked, popover.background.touch-selection button.sidebar-button:checked, popover.background.touch-selection headerbar button.titlebutton:checked, headerbar popover.background.touch-selection button.titlebutton:checked,
       popover.background.touch-selection .titlebar button.titlebutton:checked,
-      .titlebar popover.background.touch-selection button.titlebutton:checked, popover.background.magnifier button.flat:checked, popover.background.magnifier button.sidebar-button:checked, popover.background.magnifier headerbar button.titlebutton:checked, headerbar popover.background.magnifier button.titlebutton:checked,
+      .titlebar popover.background.touch-selection button.titlebutton:checked, popover.background.magnifier button.flat:checked, popover.background.magnifier notebook > header > tabs > arrow:checked, popover.background.magnifier button.sidebar-button:checked, popover.background.magnifier headerbar button.titlebutton:checked, headerbar popover.background.magnifier button.titlebutton:checked,
       popover.background.magnifier .titlebar button.titlebutton:checked,
-      .titlebar popover.background.magnifier button.titlebutton:checked, .app-notification button.flat:checked, .app-notification button.sidebar-button:checked, .app-notification headerbar button.titlebutton:checked, headerbar .app-notification button.titlebutton:checked,
+      .titlebar popover.background.magnifier button.titlebutton:checked, .app-notification button.flat:checked, .app-notification notebook > header > tabs > arrow:checked, .app-notification button.sidebar-button:checked, .app-notification headerbar button.titlebutton:checked, headerbar .app-notification button.titlebutton:checked,
       .app-notification .titlebar button.titlebutton:checked,
-      .titlebar .app-notification button.titlebutton:checked, .osd button.flat:active, .osd button.sidebar-button:active, .osd headerbar button.titlebutton:active, headerbar .osd button.titlebutton:active,
+      .titlebar .app-notification button.titlebutton:checked, .osd notebook > header > tabs > arrow.flat:active, .osd notebook > header > tabs > arrow.flat:checked, .osd
+      button.flat:active, .osd notebook > header > tabs > arrow:active, .osd
+      button.sidebar-button:active, .osd headerbar button.titlebutton:active, headerbar .osd button.titlebutton:active,
       .osd .titlebar button.titlebutton:active,
-      .titlebar .osd button.titlebutton:active, .osd button.flat:checked, .osd button.sidebar-button:checked, .osd headerbar button.titlebutton:checked, headerbar .osd button.titlebutton:checked,
+      .titlebar .osd button.titlebutton:active, .osd
+      button.flat:checked, .osd notebook > header > tabs > arrow:checked, .osd
+      button.sidebar-button:checked, .osd headerbar button.titlebutton:checked, headerbar .osd button.titlebutton:checked,
       .osd .titlebar button.titlebutton:checked,
       .titlebar .osd button.titlebutton:checked {
         color: white;
@@ -659,7 +757,9 @@ button, headerbar button.titlebutton,
         text-shadow: none;
         -gtk-icon-shadow: none;
         outline-color: rgba(238, 238, 236, 0.3); }
-  button.suggested-action, headerbar button.suggested-action.titlebutton,
+  notebook > header > tabs > arrow.suggested-action,
+  button.suggested-action,
+  headerbar button.suggested-action.titlebutton,
   .titlebar button.suggested-action.titlebutton {
     color: white;
     outline-color: rgba(255, 255, 255, 0.3);
@@ -668,7 +768,11 @@ button, headerbar button.titlebutton,
     text-shadow: 0 -1px rgba(0, 0, 0, 0.54353);
     -gtk-icon-shadow: 0 -1px rgba(0, 0, 0, 0.54353);
     box-shadow: inset 0 1px rgba(255, 255, 255, 0.4), 0 1px rgba(255, 255, 255, 0); }
-    button.suggested-action.flat, button.suggested-action.sidebar-button, headerbar button.suggested-action.titlebutton,
+    notebook > header > tabs > arrow.suggested-action.flat,
+    button.suggested-action.flat,
+    notebook > header > tabs > arrow.suggested-action,
+    button.suggested-action.sidebar-button,
+    headerbar button.suggested-action.titlebutton,
     .titlebar button.suggested-action.titlebutton {
       border-color: transparent;
       background-color: transparent;
@@ -677,6 +781,7 @@ button, headerbar button.titlebutton,
       text-shadow: none;
       -gtk-icon-shadow: none;
       color: #4a90d9; }
+    notebook > header > tabs > arrow.suggested-action:hover,
     button.suggested-action:hover {
       color: white;
       outline-color: rgba(255, 255, 255, 0.3);
@@ -691,7 +796,9 @@ button, headerbar button.titlebutton,
       text-shadow: 0 -1px rgba(0, 0, 0, 0.49553);
       -gtk-icon-shadow: 0 -1px rgba(0, 0, 0, 0.49553);
       box-shadow: inset 0 1px rgba(255, 255, 255, 0.4), 0 1px rgba(255, 255, 255, 0); }
-    button.suggested-action:active, button.suggested-action:checked {
+    notebook > header > tabs > arrow.suggested-action:active, notebook > header > tabs > arrow.suggested-action:checked,
+    button.suggested-action:active,
+    button.suggested-action:checked {
       color: white;
       outline-color: rgba(255, 255, 255, 0.3);
       border-color: #1c5187;
@@ -699,7 +806,12 @@ button, headerbar button.titlebutton,
       text-shadow: 0 -1px rgba(0, 0, 0, 0.62353);
       -gtk-icon-shadow: 0 -1px rgba(0, 0, 0, 0.62353);
       box-shadow: inset 0 2px 1px -2px rgba(0, 0, 0, 0.6), 0 1px rgba(255, 255, 255, 0); }
-    button.suggested-action:backdrop, button.suggested-action.flat:backdrop, button.suggested-action.sidebar-button:backdrop, headerbar button.suggested-action.titlebutton:backdrop,
+    notebook > header > tabs > arrow.suggested-action:backdrop, notebook > header > tabs > arrow.suggested-action.flat:backdrop,
+    button.suggested-action:backdrop,
+    button.suggested-action.flat:backdrop,
+    notebook > header > tabs > arrow.suggested-action:backdrop,
+    button.suggested-action.sidebar-button:backdrop,
+    headerbar button.suggested-action.titlebutton:backdrop,
     .titlebar button.suggested-action.titlebutton:backdrop {
       color: #dbe9f7;
       border-color: #4a90d9;
@@ -707,14 +819,29 @@ button, headerbar button.titlebutton,
       text-shadow: none;
       -gtk-icon-shadow: none;
       box-shadow: inset 0 1px rgba(255, 255, 255, 0), 0 1px rgba(255, 255, 255, 0); }
-      button.suggested-action:backdrop:active, button.suggested-action:backdrop:checked, button.suggested-action.flat:backdrop:active, button.suggested-action.sidebar-button:backdrop:active, headerbar button.suggested-action.titlebutton:backdrop:active,
-      .titlebar button.suggested-action.titlebutton:backdrop:active, button.suggested-action.flat:backdrop:checked, button.suggested-action.sidebar-button:backdrop:checked, headerbar button.suggested-action.titlebutton:backdrop:checked,
+      notebook > header > tabs > arrow.suggested-action:backdrop:active, notebook > header > tabs > arrow.suggested-action:backdrop:checked, notebook > header > tabs > arrow.suggested-action.flat:backdrop:active, notebook > header > tabs > arrow.suggested-action.flat:backdrop:checked,
+      button.suggested-action:backdrop:active,
+      button.suggested-action:backdrop:checked,
+      button.suggested-action.flat:backdrop:active,
+      notebook > header > tabs > arrow.suggested-action:backdrop:active,
+      button.suggested-action.sidebar-button:backdrop:active,
+      headerbar button.suggested-action.titlebutton:backdrop:active,
+      .titlebar button.suggested-action.titlebutton:backdrop:active,
+      button.suggested-action.flat:backdrop:checked,
+      notebook > header > tabs > arrow.suggested-action:backdrop:checked,
+      button.suggested-action.sidebar-button:backdrop:checked,
+      headerbar button.suggested-action.titlebutton:backdrop:checked,
       .titlebar button.suggested-action.titlebutton:backdrop:checked {
         color: #d4e4f4;
         border-color: #2a76c6;
         background-image: linear-gradient(to bottom, #2a76c6);
         box-shadow: inset 0 1px rgba(255, 255, 255, 0), 0 1px rgba(255, 255, 255, 0); }
-      button.suggested-action:backdrop:disabled, button.suggested-action.flat:backdrop:disabled, button.suggested-action.sidebar-button:backdrop:disabled, headerbar button.suggested-action.titlebutton:backdrop:disabled,
+      notebook > header > tabs > arrow.suggested-action:backdrop:disabled, notebook > header > tabs > arrow.suggested-action.flat:backdrop:disabled,
+      button.suggested-action:backdrop:disabled,
+      button.suggested-action.flat:backdrop:disabled,
+      notebook > header > tabs > arrow.suggested-action:backdrop:disabled,
+      button.suggested-action.sidebar-button:backdrop:disabled,
+      headerbar button.suggested-action.titlebutton:backdrop:disabled,
       .titlebar button.suggested-action.titlebutton:backdrop:disabled {
         color: #c3c3c0;
         border-color: #a5a5a1;
@@ -722,16 +849,38 @@ button, headerbar button.titlebutton,
         text-shadow: none;
         -gtk-icon-shadow: none;
         box-shadow: inset 0 1px rgba(255, 255, 255, 0), 0 1px rgba(255, 255, 255, 0); }
-        button.suggested-action:backdrop:disabled:active, button.suggested-action:backdrop:disabled:checked, button.suggested-action.flat:backdrop:disabled:active, button.suggested-action.sidebar-button:backdrop:disabled:active, headerbar button.suggested-action.titlebutton:backdrop:disabled:active,
-        .titlebar button.suggested-action.titlebutton:backdrop:disabled:active, button.suggested-action.flat:backdrop:disabled:checked, button.suggested-action.sidebar-button:backdrop:disabled:checked, headerbar button.suggested-action.titlebutton:backdrop:disabled:checked,
+        notebook > header > tabs > arrow.suggested-action:backdrop:disabled:active, notebook > header > tabs > arrow.suggested-action:backdrop:disabled:checked, notebook > header > tabs > arrow.suggested-action.flat:backdrop:disabled:active, notebook > header > tabs > arrow.suggested-action.flat:backdrop:disabled:checked,
+        button.suggested-action:backdrop:disabled:active,
+        button.suggested-action:backdrop:disabled:checked,
+        button.suggested-action.flat:backdrop:disabled:active,
+        notebook > header > tabs > arrow.suggested-action:backdrop:disabled:active,
+        button.suggested-action.sidebar-button:backdrop:disabled:active,
+        headerbar button.suggested-action.titlebutton:backdrop:disabled:active,
+        .titlebar button.suggested-action.titlebutton:backdrop:disabled:active,
+        button.suggested-action.flat:backdrop:disabled:checked,
+        notebook > header > tabs > arrow.suggested-action:backdrop:disabled:checked,
+        button.suggested-action.sidebar-button:backdrop:disabled:checked,
+        headerbar button.suggested-action.titlebutton:backdrop:disabled:checked,
         .titlebar button.suggested-action.titlebutton:backdrop:disabled:checked {
           color: #8db9e8;
           border-color: #5094db;
           background-image: linear-gradient(to bottom, #5094db);
           box-shadow: inset 0 1px rgba(255, 255, 255, 0), 0 1px rgba(255, 255, 255, 0); }
-    button.suggested-action.flat:backdrop, button.suggested-action.sidebar-button:backdrop, headerbar button.suggested-action.titlebutton:backdrop,
-    .titlebar button.suggested-action.titlebutton:backdrop, button.suggested-action.flat:disabled, button.suggested-action.sidebar-button:disabled, headerbar button.suggested-action.titlebutton:disabled,
-    .titlebar button.suggested-action.titlebutton:disabled, button.suggested-action.flat:backdrop:disabled, button.suggested-action.sidebar-button:backdrop:disabled, headerbar button.suggested-action.titlebutton:backdrop:disabled,
+    notebook > header > tabs > arrow.suggested-action.flat:backdrop, notebook > header > tabs > arrow.suggested-action.flat:disabled, notebook > header > tabs > arrow.suggested-action.flat:backdrop:disabled,
+    button.suggested-action.flat:backdrop,
+    notebook > header > tabs > arrow.suggested-action:backdrop,
+    button.suggested-action.sidebar-button:backdrop,
+    headerbar button.suggested-action.titlebutton:backdrop,
+    .titlebar button.suggested-action.titlebutton:backdrop,
+    button.suggested-action.flat:disabled,
+    notebook > header > tabs > arrow.suggested-action:disabled,
+    button.suggested-action.sidebar-button:disabled,
+    headerbar button.suggested-action.titlebutton:disabled,
+    .titlebar button.suggested-action.titlebutton:disabled,
+    button.suggested-action.flat:backdrop:disabled,
+    notebook > header > tabs > arrow.suggested-action:backdrop:disabled,
+    button.suggested-action.sidebar-button:backdrop:disabled,
+    headerbar button.suggested-action.titlebutton:backdrop:disabled,
     .titlebar button.suggested-action.titlebutton:backdrop:disabled {
       border-color: transparent;
       background-color: transparent;
@@ -740,6 +889,7 @@ button, headerbar button.titlebutton,
       text-shadow: none;
       -gtk-icon-shadow: none;
       color: rgba(74, 144, 217, 0.8); }
+    notebook > header > tabs > arrow.suggested-action:disabled,
     button.suggested-action:disabled {
       color: #8b8e8f;
       border-color: #9d9d99;
@@ -747,12 +897,15 @@ button, headerbar button.titlebutton,
       text-shadow: none;
       -gtk-icon-shadow: none;
       box-shadow: inset 0 1px rgba(255, 255, 255, 0), 0 1px rgba(255, 255, 255, 0); }
-      button.suggested-action:disabled:active, button.suggested-action:disabled:checked {
+      notebook > header > tabs > arrow.suggested-action:disabled:active, notebook > header > tabs > arrow.suggested-action:disabled:checked,
+      button.suggested-action:disabled:active,
+      button.suggested-action:disabled:checked {
         color: #b9d4f1;
         border-color: #1c5187;
         background-image: linear-gradient(to bottom, #4b8dd3, #5094db);
         box-shadow: inset 0 1px rgba(255, 255, 255, 0), 0 1px rgba(255, 255, 255, 0); }
-    .osd button.suggested-action {
+    .osd notebook > header > tabs > arrow.suggested-action, .osd
+    button.suggested-action {
       color: #eeeeec;
       border-color: rgba(0, 0, 0, 0.7);
       background-image: linear-gradient(to bottom, rgba(74, 144, 217, 0.5));
@@ -761,7 +914,8 @@ button, headerbar button.titlebutton,
       text-shadow: 0 1px black;
       -gtk-icon-shadow: 0 1px black;
       outline-color: rgba(238, 238, 236, 0.3); }
-      .osd button.suggested-action:hover {
+      .osd notebook > header > tabs > arrow.suggested-action:hover, .osd
+      button.suggested-action:hover {
         color: white;
         border-color: rgba(0, 0, 0, 0.7);
         background-image: linear-gradient(to bottom, rgba(74, 144, 217, 0.7));
@@ -770,7 +924,11 @@ button, headerbar button.titlebutton,
         text-shadow: 0 1px black;
         -gtk-icon-shadow: 0 1px black;
         outline-color: rgba(238, 238, 236, 0.3); }
-      .osd button.suggested-action:active, .osd button.suggested-action:checked, .osd button.suggested-action:backdrop:active, .osd button.suggested-action:backdrop:checked {
+      .osd notebook > header > tabs > arrow.suggested-action:active, .osd notebook > header > tabs > arrow.suggested-action:checked, .osd notebook > header > tabs > arrow.suggested-action:backdrop:active, .osd notebook > header > tabs > arrow.suggested-action:backdrop:checked, .osd
+      button.suggested-action:active, .osd
+      button.suggested-action:checked, .osd
+      button.suggested-action:backdrop:active, .osd
+      button.suggested-action:backdrop:checked {
         color: white;
         border-color: rgba(0, 0, 0, 0.7);
         background-image: linear-gradient(to bottom, #4a90d9);
@@ -779,7 +937,9 @@ button, headerbar button.titlebutton,
         text-shadow: none;
         -gtk-icon-shadow: none;
         outline-color: rgba(238, 238, 236, 0.3); }
-      .osd button.suggested-action:disabled, .osd button.suggested-action:backdrop:disabled {
+      .osd notebook > header > tabs > arrow.suggested-action:disabled, .osd notebook > header > tabs > arrow.suggested-action:backdrop:disabled, .osd
+      button.suggested-action:disabled, .osd
+      button.suggested-action:backdrop:disabled {
         color: #878a89;
         border-color: rgba(0, 0, 0, 0.7);
         background-image: linear-gradient(to bottom, rgba(53, 57, 58, 0.5));
@@ -787,7 +947,8 @@ button, headerbar button.titlebutton,
         box-shadow: none;
         text-shadow: none;
         -gtk-icon-shadow: none; }
-      .osd button.suggested-action:backdrop {
+      .osd notebook > header > tabs > arrow.suggested-action:backdrop, .osd
+      button.suggested-action:backdrop {
         color: #eeeeec;
         border-color: rgba(0, 0, 0, 0.7);
         background-image: linear-gradient(to bottom, rgba(74, 144, 217, 0.5));
@@ -795,7 +956,9 @@ button, headerbar button.titlebutton,
         box-shadow: none;
         text-shadow: none;
         -gtk-icon-shadow: none; }
-  button.destructive-action, headerbar button.destructive-action.titlebutton,
+  notebook > header > tabs > arrow.destructive-action,
+  button.destructive-action,
+  headerbar button.destructive-action.titlebutton,
   .titlebar button.destructive-action.titlebutton {
     color: white;
     outline-color: rgba(255, 255, 255, 0.3);
@@ -804,7 +967,11 @@ button, headerbar button.titlebutton,
     text-shadow: 0 -1px rgba(0, 0, 0, 0.56078);
     -gtk-icon-shadow: 0 -1px rgba(0, 0, 0, 0.56078);
     box-shadow: inset 0 1px rgba(255, 255, 255, 0.4), 0 1px rgba(255, 255, 255, 0); }
-    button.destructive-action.flat, button.destructive-action.sidebar-button, headerbar button.destructive-action.titlebutton,
+    notebook > header > tabs > arrow.destructive-action.flat,
+    button.destructive-action.flat,
+    notebook > header > tabs > arrow.destructive-action,
+    button.destructive-action.sidebar-button,
+    headerbar button.destructive-action.titlebutton,
     .titlebar button.destructive-action.titlebutton {
       border-color: transparent;
       background-color: transparent;
@@ -813,6 +980,7 @@ button, headerbar button.titlebutton,
       text-shadow: none;
       -gtk-icon-shadow: none;
       color: #ef2929; }
+    notebook > header > tabs > arrow.destructive-action:hover,
     button.destructive-action:hover {
       color: white;
       outline-color: rgba(255, 255, 255, 0.3);
@@ -827,7 +995,9 @@ button, headerbar button.titlebutton,
       text-shadow: 0 -1px rgba(0, 0, 0, 0.51278);
       -gtk-icon-shadow: 0 -1px rgba(0, 0, 0, 0.51278);
       box-shadow: inset 0 1px rgba(255, 255, 255, 0.4), 0 1px rgba(255, 255, 255, 0); }
-    button.destructive-action:active, button.destructive-action:checked {
+    notebook > header > tabs > arrow.destructive-action:active, notebook > header > tabs > arrow.destructive-action:checked,
+    button.destructive-action:active,
+    button.destructive-action:checked {
       color: white;
       outline-color: rgba(255, 255, 255, 0.3);
       border-color: #8e0b0b;
@@ -835,7 +1005,12 @@ button, headerbar button.titlebutton,
       text-shadow: 0 -1px rgba(0, 0, 0, 0.64078);
       -gtk-icon-shadow: 0 -1px rgba(0, 0, 0, 0.64078);
       box-shadow: inset 0 2px 1px -2px rgba(0, 0, 0, 0.6), 0 1px rgba(255, 255, 255, 0); }
-    button.destructive-action:backdrop, button.destructive-action.flat:backdrop, button.destructive-action.sidebar-button:backdrop, headerbar button.destructive-action.titlebutton:backdrop,
+    notebook > header > tabs > arrow.destructive-action:backdrop, notebook > header > tabs > arrow.destructive-action.flat:backdrop,
+    button.destructive-action:backdrop,
+    button.destructive-action.flat:backdrop,
+    notebook > header > tabs > arrow.destructive-action:backdrop,
+    button.destructive-action.sidebar-button:backdrop,
+    headerbar button.destructive-action.titlebutton:backdrop,
     .titlebar button.destructive-action.titlebutton:backdrop {
       color: #fcd4d4;
       border-color: #ef2929;
@@ -843,14 +1018,29 @@ button, headerbar button.titlebutton,
       text-shadow: none;
       -gtk-icon-shadow: none;
       box-shadow: inset 0 1px rgba(255, 255, 255, 0), 0 1px rgba(255, 255, 255, 0); }
-      button.destructive-action:backdrop:active, button.destructive-action:backdrop:checked, button.destructive-action.flat:backdrop:active, button.destructive-action.sidebar-button:backdrop:active, headerbar button.destructive-action.titlebutton:backdrop:active,
-      .titlebar button.destructive-action.titlebutton:backdrop:active, button.destructive-action.flat:backdrop:checked, button.destructive-action.sidebar-button:backdrop:checked, headerbar button.destructive-action.titlebutton:backdrop:checked,
+      notebook > header > tabs > arrow.destructive-action:backdrop:active, notebook > header > tabs > arrow.destructive-action:backdrop:checked, notebook > header > tabs > arrow.destructive-action.flat:backdrop:active, notebook > header > tabs > arrow.destructive-action.flat:backdrop:checked,
+      button.destructive-action:backdrop:active,
+      button.destructive-action:backdrop:checked,
+      button.destructive-action.flat:backdrop:active,
+      notebook > header > tabs > arrow.destructive-action:backdrop:active,
+      button.destructive-action.sidebar-button:backdrop:active,
+      headerbar button.destructive-action.titlebutton:backdrop:active,
+      .titlebar button.destructive-action.titlebutton:backdrop:active,
+      button.destructive-action.flat:backdrop:checked,
+      notebook > header > tabs > arrow.destructive-action:backdrop:checked,
+      button.destructive-action.sidebar-button:backdrop:checked,
+      headerbar button.destructive-action.titlebutton:backdrop:checked,
       .titlebar button.destructive-action.titlebutton:backdrop:checked {
         color: #f7cfcf;
         border-color: #d51010;
         background-image: linear-gradient(to bottom, #d51010);
         box-shadow: inset 0 1px rgba(255, 255, 255, 0), 0 1px rgba(255, 255, 255, 0); }
-      button.destructive-action:backdrop:disabled, button.destructive-action.flat:backdrop:disabled, button.destructive-action.sidebar-button:backdrop:disabled, headerbar button.destructive-action.titlebutton:backdrop:disabled,
+      notebook > header > tabs > arrow.destructive-action:backdrop:disabled, notebook > header > tabs > arrow.destructive-action.flat:backdrop:disabled,
+      button.destructive-action:backdrop:disabled,
+      button.destructive-action.flat:backdrop:disabled,
+      notebook > header > tabs > arrow.destructive-action:backdrop:disabled,
+      button.destructive-action.sidebar-button:backdrop:disabled,
+      headerbar button.destructive-action.titlebutton:backdrop:disabled,
       .titlebar button.destructive-action.titlebutton:backdrop:disabled {
         color: #c3c3c0;
         border-color: #a5a5a1;
@@ -858,16 +1048,38 @@ button, headerbar button.titlebutton,
         text-shadow: none;
         -gtk-icon-shadow: none;
         box-shadow: inset 0 1px rgba(255, 255, 255, 0), 0 1px rgba(255, 255, 255, 0); }
-        button.destructive-action:backdrop:disabled:active, button.destructive-action:backdrop:disabled:checked, button.destructive-action.flat:backdrop:disabled:active, button.destructive-action.sidebar-button:backdrop:disabled:active, headerbar button.destructive-action.titlebutton:backdrop:disabled:active,
-        .titlebar button.destructive-action.titlebutton:backdrop:disabled:active, button.destructive-action.flat:backdrop:disabled:checked, button.destructive-action.sidebar-button:backdrop:disabled:checked, headerbar button.destructive-action.titlebutton:backdrop:disabled:checked,
+        notebook > header > tabs > arrow.destructive-action:backdrop:disabled:active, notebook > header > tabs > arrow.destructive-action:backdrop:disabled:checked, notebook > header > tabs > arrow.destructive-action.flat:backdrop:disabled:active, notebook > header > tabs > arrow.destructive-action.flat:backdrop:disabled:checked,
+        button.destructive-action:backdrop:disabled:active,
+        button.destructive-action:backdrop:disabled:checked,
+        button.destructive-action.flat:backdrop:disabled:active,
+        notebook > header > tabs > arrow.destructive-action:backdrop:disabled:active,
+        button.destructive-action.sidebar-button:backdrop:disabled:active,
+        headerbar button.destructive-action.titlebutton:backdrop:disabled:active,
+        .titlebar button.destructive-action.titlebutton:backdrop:disabled:active,
+        button.destructive-action.flat:backdrop:disabled:checked,
+        notebook > header > tabs > arrow.destructive-action:backdrop:disabled:checked,
+        button.destructive-action.sidebar-button:backdrop:disabled:checked,
+        headerbar button.destructive-action.titlebutton:backdrop:disabled:checked,
         .titlebar button.destructive-action.titlebutton:backdrop:disabled:checked {
           color: #f57979;
           border-color: #ef3131;
           background-image: linear-gradient(to bottom, #ef3131);
           box-shadow: inset 0 1px rgba(255, 255, 255, 0), 0 1px rgba(255, 255, 255, 0); }
-    button.destructive-action.flat:backdrop, button.destructive-action.sidebar-button:backdrop, headerbar button.destructive-action.titlebutton:backdrop,
-    .titlebar button.destructive-action.titlebutton:backdrop, button.destructive-action.flat:disabled, button.destructive-action.sidebar-button:disabled, headerbar button.destructive-action.titlebutton:disabled,
-    .titlebar button.destructive-action.titlebutton:disabled, button.destructive-action.flat:backdrop:disabled, button.destructive-action.sidebar-button:backdrop:disabled, headerbar button.destructive-action.titlebutton:backdrop:disabled,
+    notebook > header > tabs > arrow.destructive-action.flat:backdrop, notebook > header > tabs > arrow.destructive-action.flat:disabled, notebook > header > tabs > arrow.destructive-action.flat:backdrop:disabled,
+    button.destructive-action.flat:backdrop,
+    notebook > header > tabs > arrow.destructive-action:backdrop,
+    button.destructive-action.sidebar-button:backdrop,
+    headerbar button.destructive-action.titlebutton:backdrop,
+    .titlebar button.destructive-action.titlebutton:backdrop,
+    button.destructive-action.flat:disabled,
+    notebook > header > tabs > arrow.destructive-action:disabled,
+    button.destructive-action.sidebar-button:disabled,
+    headerbar button.destructive-action.titlebutton:disabled,
+    .titlebar button.destructive-action.titlebutton:disabled,
+    button.destructive-action.flat:backdrop:disabled,
+    notebook > header > tabs > arrow.destructive-action:backdrop:disabled,
+    button.destructive-action.sidebar-button:backdrop:disabled,
+    headerbar button.destructive-action.titlebutton:backdrop:disabled,
     .titlebar button.destructive-action.titlebutton:backdrop:disabled {
       border-color: transparent;
       background-color: transparent;
@@ -876,6 +1088,7 @@ button, headerbar button.titlebutton,
       text-shadow: none;
       -gtk-icon-shadow: none;
       color: rgba(239, 41, 41, 0.8); }
+    notebook > header > tabs > arrow.destructive-action:disabled,
     button.destructive-action:disabled {
       color: #8b8e8f;
       border-color: #9d9d99;
@@ -883,12 +1096,15 @@ button, headerbar button.titlebutton,
       text-shadow: none;
       -gtk-icon-shadow: none;
       box-shadow: inset 0 1px rgba(255, 255, 255, 0), 0 1px rgba(255, 255, 255, 0); }
-      button.destructive-action:disabled:active, button.destructive-action:disabled:checked {
+      notebook > header > tabs > arrow.destructive-action:disabled:active, notebook > header > tabs > arrow.destructive-action:disabled:checked,
+      button.destructive-action:disabled:active,
+      button.destructive-action:disabled:checked {
         color: #f9adad;
         border-color: #8e0b0b;
         background-image: linear-gradient(to bottom, #e52d2d, #ef3131);
         box-shadow: inset 0 1px rgba(255, 255, 255, 0), 0 1px rgba(255, 255, 255, 0); }
-    .osd button.destructive-action {
+    .osd notebook > header > tabs > arrow.destructive-action, .osd
+    button.destructive-action {
       color: #eeeeec;
       border-color: rgba(0, 0, 0, 0.7);
       background-image: linear-gradient(to bottom, rgba(239, 41, 41, 0.5));
@@ -897,7 +1113,8 @@ button, headerbar button.titlebutton,
       text-shadow: 0 1px black;
       -gtk-icon-shadow: 0 1px black;
       outline-color: rgba(238, 238, 236, 0.3); }
-      .osd button.destructive-action:hover {
+      .osd notebook > header > tabs > arrow.destructive-action:hover, .osd
+      button.destructive-action:hover {
         color: white;
         border-color: rgba(0, 0, 0, 0.7);
         background-image: linear-gradient(to bottom, rgba(239, 41, 41, 0.7));
@@ -906,7 +1123,11 @@ button, headerbar button.titlebutton,
         text-shadow: 0 1px black;
         -gtk-icon-shadow: 0 1px black;
         outline-color: rgba(238, 238, 236, 0.3); }
-      .osd button.destructive-action:active, .osd button.destructive-action:checked, .osd button.destructive-action:backdrop:active, .osd button.destructive-action:backdrop:checked {
+      .osd notebook > header > tabs > arrow.destructive-action:active, .osd notebook > header > tabs > arrow.destructive-action:checked, .osd notebook > header > tabs > arrow.destructive-action:backdrop:active, .osd notebook > header > tabs > arrow.destructive-action:backdrop:checked, .osd
+      button.destructive-action:active, .osd
+      button.destructive-action:checked, .osd
+      button.destructive-action:backdrop:active, .osd
+      button.destructive-action:backdrop:checked {
         color: white;
         border-color: rgba(0, 0, 0, 0.7);
         background-image: linear-gradient(to bottom, #ef2929);
@@ -915,7 +1136,9 @@ button, headerbar button.titlebutton,
         text-shadow: none;
         -gtk-icon-shadow: none;
         outline-color: rgba(238, 238, 236, 0.3); }
-      .osd button.destructive-action:disabled, .osd button.destructive-action:backdrop:disabled {
+      .osd notebook > header > tabs > arrow.destructive-action:disabled, .osd notebook > header > tabs > arrow.destructive-action:backdrop:disabled, .osd
+      button.destructive-action:disabled, .osd
+      button.destructive-action:backdrop:disabled {
         color: #878a89;
         border-color: rgba(0, 0, 0, 0.7);
         background-image: linear-gradient(to bottom, rgba(53, 57, 58, 0.5));
@@ -923,7 +1146,8 @@ button, headerbar button.titlebutton,
         box-shadow: none;
         text-shadow: none;
         -gtk-icon-shadow: none; }
-      .osd button.destructive-action:backdrop {
+      .osd notebook > header > tabs > arrow.destructive-action:backdrop, .osd
+      button.destructive-action:backdrop {
         color: #eeeeec;
         border-color: rgba(0, 0, 0, 0.7);
         background-image: linear-gradient(to bottom, rgba(239, 41, 41, 0.5));
@@ -931,57 +1155,79 @@ button, headerbar button.titlebutton,
         box-shadow: none;
         text-shadow: none;
         -gtk-icon-shadow: none; }
-  button.text-button, headerbar button.text-button.titlebutton,
+  notebook > header > tabs > arrow.text-button,
+  button.text-button,
+  headerbar button.text-button.titlebutton,
   .titlebar button.text-button.titlebutton {
     padding-left: 16px;
     padding-right: 16px; }
+  notebook > header > tabs > arrow.text-button.image-button label:first-child,
   button.text-button.image-button label:first-child {
     padding-left: 8px; }
+  notebook > header > tabs > arrow.text-button.image-button label:last-child,
   button.text-button.image-button label:last-child {
     padding-right: 8px; }
-  .stack-switcher > button, headerbar .stack-switcher > button.titlebutton,
+  notebook > header > tabs.stack-switcher > arrow, .stack-switcher >
+  button, headerbar .stack-switcher > button.titlebutton,
   .titlebar .stack-switcher > button.titlebutton {
     outline-offset: -3px; }
-    .stack-switcher > button > label,
+    notebook > header > tabs.stack-switcher > arrow > label, .stack-switcher >
+    button > label,
     .titlebar .stack-switcher > button.titlebutton > label {
       padding-left: 6px;
       padding-right: 6px; }
-    .stack-switcher > button > image,
+    notebook > header > tabs.stack-switcher > arrow > image, .stack-switcher >
+    button > image,
     .titlebar .stack-switcher > button.titlebutton > image {
       padding-left: 6px;
       padding-right: 6px;
       padding-top: 3px;
       padding-bottom: 3px; }
-    .stack-switcher > button.text-button, headerbar .stack-switcher > button.text-button.titlebutton,
+    notebook > header > tabs.stack-switcher > arrow.text-button, .stack-switcher >
+    button.text-button, headerbar .stack-switcher > button.text-button.titlebutton,
     .titlebar .stack-switcher > button.text-button.titlebutton {
       padding-left: 10px;
       padding-right: 10px; }
-    .stack-switcher > button.image-button, headerbar .stack-switcher > button.image-button.titlebutton,
+    notebook > header > tabs.stack-switcher > arrow.image-button, .stack-switcher >
+    button.image-button, headerbar .stack-switcher > button.image-button.titlebutton,
     .titlebar .stack-switcher > button.image-button.titlebutton {
       padding-left: 2px;
       padding-right: 2px; }
-    .stack-switcher > button.needs-attention:active > label, .stack-switcher > button.needs-attention:active > image, .stack-switcher > button.needs-attention:checked > label, .stack-switcher > button.needs-attention:checked > image {
+    notebook > header > tabs.stack-switcher > arrow.needs-attention:active > label, notebook > header > tabs.stack-switcher > arrow.needs-attention:active > image, notebook > header > tabs.stack-switcher > arrow.needs-attention:checked > label, notebook > header > tabs.stack-switcher > arrow.needs-attention:checked > image, .stack-switcher >
+    button.needs-attention:active > label, .stack-switcher >
+    button.needs-attention:active > image, .stack-switcher >
+    button.needs-attention:checked > label, .stack-switcher >
+    button.needs-attention:checked > image {
       animation: none;
       background-image: none; }
-  .inline-toolbar button, .inline-toolbar headerbar button.titlebutton, headerbar .inline-toolbar button.titlebutton,
+  .inline-toolbar notebook > header > tabs > arrow, .inline-toolbar notebook > header > tabs > arrow:backdrop, .inline-toolbar
+  button, .inline-toolbar headerbar button.titlebutton, headerbar .inline-toolbar button.titlebutton,
   .inline-toolbar .titlebar button.titlebutton,
-  .titlebar .inline-toolbar button.titlebutton, .inline-toolbar button:backdrop {
+  .titlebar .inline-toolbar button.titlebutton, .inline-toolbar
+  button:backdrop {
     border-radius: 2px;
     border-width: 1px; }
-  .primary-toolbar button, .primary-toolbar headerbar button.titlebutton, headerbar .primary-toolbar button.titlebutton,
+  .primary-toolbar notebook > header > tabs > arrow, .primary-toolbar
+  button, .primary-toolbar headerbar button.titlebutton, headerbar .primary-toolbar button.titlebutton,
   .primary-toolbar .titlebar button.titlebutton,
   .titlebar .primary-toolbar button.titlebutton {
     -gtk-icon-shadow: none; }
 
-.stack-switcher > button.needs-attention > label, .stack-switcher > button.needs-attention > image, stacksidebar row.needs-attention > label {
+notebook > header > tabs.stack-switcher > arrow.needs-attention > label, notebook > header > tabs.stack-switcher > arrow.needs-attention > image, .stack-switcher >
+button.needs-attention > label, .stack-switcher >
+button.needs-attention > image, stacksidebar row.needs-attention > label {
   animation: needs_attention 150ms ease-in;
   background-image: -gtk-gradient(radial, center center, 0, center center, 0.5, to(#4a90d9), to(transparent)), -gtk-gradient(radial, center center, 0, center center, 0.5, to(rgba(255, 255, 255, 0.76923)), to(transparent));
   background-size: 6px 6px, 6px 6px;
   background-repeat: no-repeat;
   background-position: right 3px, right 4px; }
-  .stack-switcher > button.needs-attention > label:backdrop, .stack-switcher > button.needs-attention > image:backdrop, stacksidebar row.needs-attention > label:backdrop {
+  notebook > header > tabs.stack-switcher > arrow.needs-attention > label:backdrop, notebook > header > tabs.stack-switcher > arrow.needs-attention > image:backdrop, .stack-switcher >
+  button.needs-attention > label:backdrop, .stack-switcher >
+  button.needs-attention > image:backdrop, stacksidebar row.needs-attention > label:backdrop {
     background-size: 6px 6px, 0 0; }
-  .stack-switcher > button.needs-attention > label:dir(rtl), .stack-switcher > button.needs-attention > image:dir(rtl), stacksidebar row.needs-attention > label:dir(rtl) {
+  notebook > header > tabs.stack-switcher > arrow.needs-attention > label:dir(rtl), notebook > header > tabs.stack-switcher > arrow.needs-attention > image:dir(rtl), .stack-switcher >
+  button.needs-attention > label:dir(rtl), .stack-switcher >
+  button.needs-attention > image:dir(rtl), stacksidebar row.needs-attention > label:dir(rtl) {
     background-position: left 3px, left 4px; }
 
 .inline-toolbar toolbutton > button, .inline-toolbar headerbar toolbutton > button.titlebutton,
@@ -1079,14 +1325,23 @@ searchbar.inline-toolbar toolbutton:backdrop > button.sidebar-button,
 .inline-toolbar headerbar toolbutton:backdrop > button.titlebutton,
 headerbar .inline-toolbar toolbutton:backdrop > button.titlebutton,
 .inline-toolbar .titlebar toolbutton:backdrop > button.titlebutton,
-.titlebar .inline-toolbar toolbutton:backdrop > button.titlebutton, .linked:not(.vertical) > entry, .linked:not(.vertical) > spinbutton:not(.vertical), .inline-toolbar button, .inline-toolbar headerbar button.titlebutton, headerbar .inline-toolbar button.titlebutton,
+.titlebar .inline-toolbar toolbutton:backdrop > button.titlebutton, .linked:not(.vertical) > entry, .linked:not(.vertical) > spinbutton:not(.vertical), .inline-toolbar notebook > header > tabs > arrow, .inline-toolbar notebook > header > tabs > arrow:backdrop, .inline-toolbar
+button, .inline-toolbar headerbar button.titlebutton, headerbar .inline-toolbar button.titlebutton,
 .inline-toolbar .titlebar button.titlebutton,
-.titlebar .inline-toolbar button.titlebutton, .inline-toolbar button:backdrop, .linked > button, headerbar .linked > button.titlebutton,
-.titlebar .linked > button.titlebutton, .linked > button:hover, .linked > button:active, .linked > button:checked, .linked > button:backdrop, .linked > combobox > button.combo:dir(ltr), .linked > combobox > button.combo:dir(rtl) {
+.titlebar .inline-toolbar button.titlebutton, .inline-toolbar
+button:backdrop, notebook > header > tabs.linked > arrow, notebook > header > tabs.linked > arrow:hover, notebook > header > tabs.linked > arrow:active, notebook > header > tabs.linked > arrow:checked, notebook > header > tabs.linked > arrow:backdrop, .linked >
+button, headerbar .linked > button.titlebutton,
+.titlebar .linked > button.titlebutton, .linked >
+button:hover, .linked >
+button:active, .linked >
+button:checked, .linked >
+button:backdrop, .linked > combobox > button.combo:dir(ltr), .linked > combobox > button.combo:dir(rtl) {
   border-radius: 0;
   border-right-style: none; }
 
-.linked:not(.vertical) > entry:first-child, .linked:not(.vertical) > spinbutton:first-child:not(.vertical), .inline-toolbar button:first-child, .linked > button:first-child, headerbar .linked > button.titlebutton:first-child,
+.linked:not(.vertical) > entry:first-child, .linked:not(.vertical) > spinbutton:first-child:not(.vertical), .inline-toolbar notebook > header > tabs > arrow:first-child, .inline-toolbar notebook > header > tabs > arrow:first-child:backdrop, .inline-toolbar
+button:first-child, notebook > header > tabs.linked > arrow:first-child, notebook > header > tabs.linked > arrow:first-child:hover, notebook > header > tabs.linked > arrow:first-child:active, notebook > header > tabs.linked > arrow:first-child:checked, notebook > header > tabs.linked > arrow:first-child:backdrop, .linked >
+button:first-child, headerbar .linked > button.titlebutton:first-child,
 .titlebar .linked > button.titlebutton:first-child, toolbar.inline-toolbar toolbutton:first-child > button.flat, .inline-toolbar toolbutton:first-child > button.flat, searchbar.inline-toolbar toolbutton:first-child > button.flat,
 .inline-toolbar.location-bar toolbutton:first-child > button.flat, toolbar.inline-toolbar toolbutton:first-child > button.sidebar-button, .inline-toolbar toolbutton:first-child > button.sidebar-button, searchbar.inline-toolbar toolbutton:first-child > button.sidebar-button,
 .inline-toolbar.location-bar toolbutton:first-child > button.sidebar-button, .inline-toolbar headerbar toolbutton:first-child > button.titlebutton, headerbar .inline-toolbar toolbutton:first-child > button.titlebutton,
@@ -1106,7 +1361,9 @@ headerbar .inline-toolbar toolbutton:backdrop:first-child > button.titlebutton,
 .titlebar .inline-toolbar toolbutton:backdrop:first-child > button.titlebutton, combobox.linked button:nth-child(2):dir(rtl), .linked:not(.vertical) > combobox:first-child > button.combo {
   border-top-left-radius: 3px;
   border-bottom-left-radius: 3px; }
-.linked:not(.vertical) > entry:last-child, .linked:not(.vertical) > spinbutton:last-child:not(.vertical), .inline-toolbar button:last-child, .linked > button:last-child, headerbar .linked > button.titlebutton:last-child,
+.linked:not(.vertical) > entry:last-child, .linked:not(.vertical) > spinbutton:last-child:not(.vertical), .inline-toolbar notebook > header > tabs > arrow:last-child, .inline-toolbar notebook > header > tabs > arrow:last-child:backdrop, .inline-toolbar
+button:last-child, notebook > header > tabs.linked > arrow:last-child, notebook > header > tabs.linked > arrow:last-child:hover, notebook > header > tabs.linked > arrow:last-child:active, notebook > header > tabs.linked > arrow:last-child:checked, notebook > header > tabs.linked > arrow:last-child:backdrop, .linked >
+button:last-child, headerbar .linked > button.titlebutton:last-child,
 .titlebar .linked > button.titlebutton:last-child, toolbar.inline-toolbar toolbutton:last-child > button.flat, .inline-toolbar toolbutton:last-child > button.flat, searchbar.inline-toolbar toolbutton:last-child > button.flat,
 .inline-toolbar.location-bar toolbutton:last-child > button.flat, toolbar.inline-toolbar toolbutton:last-child > button.sidebar-button, .inline-toolbar toolbutton:last-child > button.sidebar-button, searchbar.inline-toolbar toolbutton:last-child > button.sidebar-button,
 .inline-toolbar.location-bar toolbutton:last-child > button.sidebar-button, .inline-toolbar headerbar toolbutton:last-child > button.titlebutton, headerbar .inline-toolbar toolbutton:last-child > button.titlebutton,
@@ -1127,7 +1384,9 @@ headerbar .inline-toolbar toolbutton:backdrop:last-child > button.titlebutton,
   border-top-right-radius: 3px;
   border-bottom-right-radius: 3px;
   border-right-style: solid; }
-.linked:not(.vertical) > entry:only-child, .linked:not(.vertical) > spinbutton:only-child:not(.vertical), .inline-toolbar button:only-child, .linked > button:only-child, headerbar .linked > button.titlebutton:only-child,
+.linked:not(.vertical) > entry:only-child, .linked:not(.vertical) > spinbutton:only-child:not(.vertical), .inline-toolbar notebook > header > tabs > arrow:only-child, .inline-toolbar notebook > header > tabs > arrow:only-child:backdrop, .inline-toolbar
+button:only-child, notebook > header > tabs.linked > arrow:only-child, notebook > header > tabs.linked > arrow:only-child:hover, notebook > header > tabs.linked > arrow:only-child:active, notebook > header > tabs.linked > arrow:only-child:checked, notebook > header > tabs.linked > arrow:only-child:backdrop, .linked >
+button:only-child, headerbar .linked > button.titlebutton:only-child,
 .titlebar .linked > button.titlebutton:only-child, toolbar.inline-toolbar toolbutton:only-child > button.flat, .inline-toolbar toolbutton:only-child > button.flat, searchbar.inline-toolbar toolbutton:only-child > button.flat,
 .inline-toolbar.location-bar toolbutton:only-child > button.flat, toolbar.inline-toolbar toolbutton:only-child > button.sidebar-button, .inline-toolbar toolbutton:only-child > button.sidebar-button, searchbar.inline-toolbar toolbutton:only-child > button.sidebar-button,
 .inline-toolbar.location-bar toolbutton:only-child > button.sidebar-button, .inline-toolbar headerbar toolbutton:only-child > button.titlebutton, headerbar .inline-toolbar toolbutton:only-child > button.titlebutton,
@@ -1148,21 +1407,29 @@ headerbar .inline-toolbar toolbutton:backdrop:only-child > button.titlebutton,
   border-radius: 3px;
   border-style: solid; }
 
-.linked.vertical > entry, .linked.vertical > spinbutton:not(.vertical), .linked.vertical > button, headerbar .linked.vertical > button.titlebutton,
-.titlebar .linked.vertical > button.titlebutton, .linked.vertical > button:hover, .linked.vertical > button:active, .linked.vertical > button:checked, .linked.vertical > button:backdrop, .linked.vertical > combobox > button.combo {
+.linked.vertical > entry, .linked.vertical > spinbutton:not(.vertical), notebook > header > tabs.linked.vertical > arrow, notebook > header > tabs.linked.vertical > arrow:hover, notebook > header > tabs.linked.vertical > arrow:active, notebook > header > tabs.linked.vertical > arrow:checked, notebook > header > tabs.linked.vertical > arrow:backdrop, .linked.vertical >
+button, headerbar .linked.vertical > button.titlebutton,
+.titlebar .linked.vertical > button.titlebutton, .linked.vertical >
+button:hover, .linked.vertical >
+button:active, .linked.vertical >
+button:checked, .linked.vertical >
+button:backdrop, .linked.vertical > combobox > button.combo {
   border-style: solid solid none solid;
   border-radius: 0; }
 
-.linked.vertical > entry:first-child, .linked.vertical > spinbutton:first-child:not(.vertical), .linked.vertical > button:first-child, headerbar .linked.vertical > button.titlebutton:first-child,
+.linked.vertical > entry:first-child, .linked.vertical > spinbutton:first-child:not(.vertical), notebook > header > tabs.linked.vertical > arrow:first-child, notebook > header > tabs.linked.vertical > arrow:first-child:hover, notebook > header > tabs.linked.vertical > arrow:first-child:active, notebook > header > tabs.linked.vertical > arrow:first-child:checked, notebook > header > tabs.linked.vertical > arrow:first-child:backdrop, .linked.vertical >
+button:first-child, headerbar .linked.vertical > button.titlebutton:first-child,
 .titlebar .linked.vertical > button.titlebutton:first-child, .linked.vertical > combobox:first-child > button.combo {
   border-top-left-radius: 3px;
   border-top-right-radius: 3px; }
-.linked.vertical > entry:last-child, .linked.vertical > spinbutton:last-child:not(.vertical), .linked.vertical > button:last-child, headerbar .linked.vertical > button.titlebutton:last-child,
+.linked.vertical > entry:last-child, .linked.vertical > spinbutton:last-child:not(.vertical), notebook > header > tabs.linked.vertical > arrow:last-child, notebook > header > tabs.linked.vertical > arrow:last-child:hover, notebook > header > tabs.linked.vertical > arrow:last-child:active, notebook > header > tabs.linked.vertical > arrow:last-child:checked, notebook > header > tabs.linked.vertical > arrow:last-child:backdrop, .linked.vertical >
+button:last-child, headerbar .linked.vertical > button.titlebutton:last-child,
 .titlebar .linked.vertical > button.titlebutton:last-child, .linked.vertical > combobox:last-child > button.combo {
   border-bottom-left-radius: 3px;
   border-bottom-right-radius: 3px;
   border-style: solid; }
-.linked.vertical > entry:only-child, .linked.vertical > spinbutton:only-child:not(.vertical), .linked.vertical > button:only-child, headerbar .linked.vertical > button.titlebutton:only-child,
+.linked.vertical > entry:only-child, .linked.vertical > spinbutton:only-child:not(.vertical), notebook > header > tabs.linked.vertical > arrow:only-child, notebook > header > tabs.linked.vertical > arrow:only-child:hover, notebook > header > tabs.linked.vertical > arrow:only-child:active, notebook > header > tabs.linked.vertical > arrow:only-child:checked, notebook > header > tabs.linked.vertical > arrow:only-child:backdrop, .linked.vertical >
+button:only-child, headerbar .linked.vertical > button.titlebutton:only-child,
 .titlebar .linked.vertical > button.titlebutton:only-child, .linked.vertical > combobox:only-child > button.combo {
   border-radius: 3px;
   border-style: solid; }
@@ -1623,9 +1890,10 @@ headerbar {
       text-shadow: 0 -1px rgba(0, 0, 0, 0.54353);
       -gtk-icon-shadow: 0 -1px rgba(0, 0, 0, 0.54353);
       box-shadow: inset 0 1px rgba(255, 255, 255, 0.4), 0 1px rgba(146, 188, 232, 0); }
-      .selection-mode.titlebar:not(headerbar) button.flat, .selection-mode.titlebar:not(headerbar) button.sidebar-button,
+      .selection-mode.titlebar:not(headerbar) button.flat, .selection-mode.titlebar:not(headerbar) notebook > header > tabs > arrow, .selection-mode.titlebar:not(headerbar) button.sidebar-button,
       .selection-mode.titlebar:not(headerbar) button.titlebutton,
       headerbar.selection-mode button.flat,
+      headerbar.selection-mode notebook > header > tabs > arrow,
       headerbar.selection-mode button.sidebar-button,
       headerbar.selection-mode button.titlebutton {
         border-color: transparent;
@@ -1659,10 +1927,11 @@ headerbar {
         text-shadow: 0 -1px rgba(0, 0, 0, 0.62353);
         -gtk-icon-shadow: 0 -1px rgba(0, 0, 0, 0.62353);
         box-shadow: inset 0 2px 1px -2px rgba(0, 0, 0, 0.6), 0 1px rgba(146, 188, 232, 0); }
-      .selection-mode.titlebar:not(headerbar) button:backdrop, .selection-mode.titlebar:not(headerbar) button.flat:backdrop, .selection-mode.titlebar:not(headerbar) button.sidebar-button:backdrop,
+      .selection-mode.titlebar:not(headerbar) button:backdrop, .selection-mode.titlebar:not(headerbar) button.flat:backdrop, .selection-mode.titlebar:not(headerbar) notebook > header > tabs > arrow:backdrop, .selection-mode.titlebar:not(headerbar) button.sidebar-button:backdrop,
       .selection-mode.titlebar:not(headerbar) button.titlebutton:backdrop,
       headerbar.selection-mode button:backdrop,
       headerbar.selection-mode button.flat:backdrop,
+      headerbar.selection-mode notebook > header > tabs > arrow:backdrop,
       headerbar.selection-mode button.sidebar-button:backdrop,
       headerbar.selection-mode button.titlebutton:backdrop {
         color: #dbe9f7;
@@ -1673,15 +1942,17 @@ headerbar {
         box-shadow: inset 0 1px rgba(255, 255, 255, 0), 0 1px rgba(146, 188, 232, 0);
         -gtk-icon-effect: none;
         border-color: #184472; }
-        .selection-mode.titlebar:not(headerbar) button:backdrop:active, .selection-mode.titlebar:not(headerbar) button:backdrop:checked, .selection-mode.titlebar:not(headerbar) button.flat:backdrop:active, .selection-mode.titlebar:not(headerbar) button.sidebar-button:backdrop:active,
-        .selection-mode.titlebar:not(headerbar) button.titlebutton:backdrop:active, .selection-mode.titlebar:not(headerbar) button.flat:backdrop:checked, .selection-mode.titlebar:not(headerbar) button.sidebar-button:backdrop:checked,
+        .selection-mode.titlebar:not(headerbar) button:backdrop:active, .selection-mode.titlebar:not(headerbar) button:backdrop:checked, .selection-mode.titlebar:not(headerbar) button.flat:backdrop:active, .selection-mode.titlebar:not(headerbar) notebook > header > tabs > arrow:backdrop:active, .selection-mode.titlebar:not(headerbar) button.sidebar-button:backdrop:active,
+        .selection-mode.titlebar:not(headerbar) button.titlebutton:backdrop:active, .selection-mode.titlebar:not(headerbar) button.flat:backdrop:checked, .selection-mode.titlebar:not(headerbar) notebook > header > tabs > arrow:backdrop:checked, .selection-mode.titlebar:not(headerbar) button.sidebar-button:backdrop:checked,
         .selection-mode.titlebar:not(headerbar) button.titlebutton:backdrop:checked,
         headerbar.selection-mode button:backdrop:active,
         headerbar.selection-mode button:backdrop:checked,
         headerbar.selection-mode button.flat:backdrop:active,
+        headerbar.selection-mode notebook > header > tabs > arrow:backdrop:active,
         headerbar.selection-mode button.sidebar-button:backdrop:active,
         headerbar.selection-mode button.titlebutton:backdrop:active,
         headerbar.selection-mode button.flat:backdrop:checked,
+        headerbar.selection-mode notebook > header > tabs > arrow:backdrop:checked,
         headerbar.selection-mode button.sidebar-button:backdrop:checked,
         headerbar.selection-mode button.titlebutton:backdrop:checked {
           color: #d4e4f4;
@@ -1689,10 +1960,11 @@ headerbar {
           background-image: linear-gradient(to bottom, #2a76c6);
           box-shadow: inset 0 1px rgba(255, 255, 255, 0), 0 1px rgba(146, 188, 232, 0);
           border-color: #184472; }
-        .selection-mode.titlebar:not(headerbar) button:backdrop:disabled, .selection-mode.titlebar:not(headerbar) button.flat:backdrop:disabled, .selection-mode.titlebar:not(headerbar) button.sidebar-button:backdrop:disabled,
+        .selection-mode.titlebar:not(headerbar) button:backdrop:disabled, .selection-mode.titlebar:not(headerbar) button.flat:backdrop:disabled, .selection-mode.titlebar:not(headerbar) notebook > header > tabs > arrow:backdrop:disabled, .selection-mode.titlebar:not(headerbar) button.sidebar-button:backdrop:disabled,
         .selection-mode.titlebar:not(headerbar) button.titlebutton:backdrop:disabled,
         headerbar.selection-mode button:backdrop:disabled,
         headerbar.selection-mode button.flat:backdrop:disabled,
+        headerbar.selection-mode notebook > header > tabs > arrow:backdrop:disabled,
         headerbar.selection-mode button.sidebar-button:backdrop:disabled,
         headerbar.selection-mode button.titlebutton:backdrop:disabled {
           color: #9bc2ea;
@@ -1702,15 +1974,17 @@ headerbar {
           -gtk-icon-shadow: none;
           box-shadow: inset 0 1px rgba(255, 255, 255, 0), 0 1px rgba(146, 188, 232, 0);
           border-color: #184472; }
-        .selection-mode.titlebar:not(headerbar) button:backdrop:disabled:active, .selection-mode.titlebar:not(headerbar) button:backdrop:disabled:checked, .selection-mode.titlebar:not(headerbar) button.flat:backdrop:disabled:active, .selection-mode.titlebar:not(headerbar) button.sidebar-button:backdrop:disabled:active,
-        .selection-mode.titlebar:not(headerbar) button.titlebutton:backdrop:disabled:active, .selection-mode.titlebar:not(headerbar) button.flat:backdrop:disabled:checked, .selection-mode.titlebar:not(headerbar) button.sidebar-button:backdrop:disabled:checked,
+        .selection-mode.titlebar:not(headerbar) button:backdrop:disabled:active, .selection-mode.titlebar:not(headerbar) button:backdrop:disabled:checked, .selection-mode.titlebar:not(headerbar) button.flat:backdrop:disabled:active, .selection-mode.titlebar:not(headerbar) notebook > header > tabs > arrow:backdrop:disabled:active, .selection-mode.titlebar:not(headerbar) button.sidebar-button:backdrop:disabled:active,
+        .selection-mode.titlebar:not(headerbar) button.titlebutton:backdrop:disabled:active, .selection-mode.titlebar:not(headerbar) button.flat:backdrop:disabled:checked, .selection-mode.titlebar:not(headerbar) notebook > header > tabs > arrow:backdrop:disabled:checked, .selection-mode.titlebar:not(headerbar) button.sidebar-button:backdrop:disabled:checked,
         .selection-mode.titlebar:not(headerbar) button.titlebutton:backdrop:disabled:checked,
         headerbar.selection-mode button:backdrop:disabled:active,
         headerbar.selection-mode button:backdrop:disabled:checked,
         headerbar.selection-mode button.flat:backdrop:disabled:active,
+        headerbar.selection-mode notebook > header > tabs > arrow:backdrop:disabled:active,
         headerbar.selection-mode button.sidebar-button:backdrop:disabled:active,
         headerbar.selection-mode button.titlebutton:backdrop:disabled:active,
         headerbar.selection-mode button.flat:backdrop:disabled:checked,
+        headerbar.selection-mode notebook > header > tabs > arrow:backdrop:disabled:checked,
         headerbar.selection-mode button.sidebar-button:backdrop:disabled:checked,
         headerbar.selection-mode button.titlebutton:backdrop:disabled:checked {
           color: #8db9e8;
@@ -1718,17 +1992,20 @@ headerbar {
           background-image: linear-gradient(to bottom, #5094db);
           box-shadow: inset 0 1px rgba(255, 255, 255, 0), 0 1px rgba(146, 188, 232, 0);
           border-color: #184472; }
-      .selection-mode.titlebar:not(headerbar) button.flat:backdrop, .selection-mode.titlebar:not(headerbar) button.sidebar-button:backdrop,
-      .selection-mode.titlebar:not(headerbar) button.titlebutton:backdrop, .selection-mode.titlebar:not(headerbar) button.flat:disabled, .selection-mode.titlebar:not(headerbar) button.sidebar-button:disabled,
-      .selection-mode.titlebar:not(headerbar) button.titlebutton:disabled, .selection-mode.titlebar:not(headerbar) button.flat:disabled:backdrop, .selection-mode.titlebar:not(headerbar) button.sidebar-button:disabled:backdrop,
+      .selection-mode.titlebar:not(headerbar) button.flat:backdrop, .selection-mode.titlebar:not(headerbar) notebook > header > tabs > arrow:backdrop, .selection-mode.titlebar:not(headerbar) button.sidebar-button:backdrop,
+      .selection-mode.titlebar:not(headerbar) button.titlebutton:backdrop, .selection-mode.titlebar:not(headerbar) button.flat:disabled, .selection-mode.titlebar:not(headerbar) notebook > header > tabs > arrow:disabled, .selection-mode.titlebar:not(headerbar) button.sidebar-button:disabled,
+      .selection-mode.titlebar:not(headerbar) button.titlebutton:disabled, .selection-mode.titlebar:not(headerbar) button.flat:disabled:backdrop, .selection-mode.titlebar:not(headerbar) notebook > header > tabs > arrow:disabled:backdrop, .selection-mode.titlebar:not(headerbar) button.sidebar-button:disabled:backdrop,
       .selection-mode.titlebar:not(headerbar) button.titlebutton:disabled:backdrop,
       headerbar.selection-mode button.flat:backdrop,
+      headerbar.selection-mode notebook > header > tabs > arrow:backdrop,
       headerbar.selection-mode button.sidebar-button:backdrop,
       headerbar.selection-mode button.titlebutton:backdrop,
       headerbar.selection-mode button.flat:disabled,
+      headerbar.selection-mode notebook > header > tabs > arrow:disabled,
       headerbar.selection-mode button.sidebar-button:disabled,
       headerbar.selection-mode button.titlebutton:disabled,
       headerbar.selection-mode button.flat:disabled:backdrop,
+      headerbar.selection-mode notebook > header > tabs > arrow:disabled:backdrop,
       headerbar.selection-mode button.sidebar-button:disabled:backdrop,
       headerbar.selection-mode button.titlebutton:disabled:backdrop {
         border-color: transparent;
@@ -2203,8 +2480,29 @@ notebook > header {
         box-shadow: none; }
       notebook > header.right > tabs > tab:active {
         box-shadow: inset 3px 0 #4a90d9; }
-  notebook > header arrow:disabled {
-    color: #8b8e8f; }
+  notebook > header > tabs > arrow {
+    min-height: 16px;
+    min-width: 16px;
+    margin-left: -5px;
+    margin-right: -5px;
+    padding-left: 4px;
+    padding-right: 4px;
+    border-top-style: none;
+    border-radius: 0; }
+    notebook > header > tabs > arrow:hover:not(:active):not(:backdrop) {
+      background-image: none;
+      background-color: rgba(255, 255, 255, 0.3);
+      border-left-color: transparent;
+      border-right-color: transparent;
+      box-shadow: none; }
+    notebook > header > tabs > arrow:disabled {
+      background-image: none;
+      background-color: transparent;
+      border-color: transparent; }
+    notebook > header > tabs > arrow.down {
+      -gtk-icon-source: -gtk-icontheme("pan-start-symbolic"); }
+    notebook > header > tabs > arrow.up {
+      -gtk-icon-source: -gtk-icontheme("pan-end-symbolic"); }
   notebook > header tab {
     font-weight: bold;
     min-height: 36px;
@@ -2236,7 +2534,7 @@ notebook > header {
       notebook > header tab:backdrop:active.reorderable-page {
         border-color: #a5a5a1;
         background-color: #e8e8e7; }
-    notebook > header tab button.flat, notebook > header tab button.sidebar-button, notebook > header tab headerbar button.titlebutton, headerbar notebook > header tab button.titlebutton,
+    notebook > header tab button.flat, notebook > header tab notebook > header > tabs > arrow, notebook > header tab button.sidebar-button, notebook > header tab headerbar button.titlebutton, headerbar notebook > header tab button.titlebutton,
     notebook > header tab .titlebar button.titlebutton,
     .titlebar notebook > header tab button.titlebutton {
       padding: 0;
@@ -2244,22 +2542,22 @@ notebook > header {
       margin-bottom: 8px;
       min-width: 18px;
       min-height: 18px; }
-      notebook > header tab button.flat:hover, notebook > header tab button.sidebar-button:hover, notebook > header tab headerbar button.titlebutton:hover, headerbar notebook > header tab button.titlebutton:hover,
+      notebook > header tab button.flat:hover, notebook > header tab notebook > header > tabs > arrow:hover, notebook > header tab button.sidebar-button:hover, notebook > header tab headerbar button.titlebutton:hover, headerbar notebook > header tab button.titlebutton:hover,
       notebook > header tab .titlebar button.titlebutton:hover,
       .titlebar notebook > header tab button.titlebutton:hover {
         color: currentColor; }
-      notebook > header tab button.flat, notebook > header tab button.sidebar-button, notebook > header tab headerbar button.titlebutton, headerbar notebook > header tab button.titlebutton,
+      notebook > header tab button.flat, notebook > header tab notebook > header > tabs > arrow, notebook > header tab button.sidebar-button, notebook > header tab headerbar button.titlebutton, headerbar notebook > header tab button.titlebutton,
       notebook > header tab .titlebar button.titlebutton,
-      .titlebar notebook > header tab button.titlebutton, notebook > header tab button.flat:backdrop, notebook > header tab button.sidebar-button:backdrop, notebook > header tab headerbar button.titlebutton:backdrop, headerbar notebook > header tab button.titlebutton:backdrop,
+      .titlebar notebook > header tab button.titlebutton, notebook > header tab button.flat:backdrop, notebook > header tab notebook > header > tabs > arrow:backdrop, notebook > header tab button.sidebar-button:backdrop, notebook > header tab headerbar button.titlebutton:backdrop, headerbar notebook > header tab button.titlebutton:backdrop,
       notebook > header tab .titlebar button.titlebutton:backdrop,
       .titlebar notebook > header tab button.titlebutton:backdrop {
         color: alpha(currentColor,0.3); }
-      notebook > header tab button.flat:last-child, notebook > header tab button.sidebar-button:last-child, notebook > header tab headerbar button.titlebutton:last-child, headerbar notebook > header tab button.titlebutton:last-child,
+      notebook > header tab button.flat:last-child, notebook > header tab notebook > header > tabs > arrow:last-child, notebook > header tab button.sidebar-button:last-child, notebook > header tab headerbar button.titlebutton:last-child, headerbar notebook > header tab button.titlebutton:last-child,
       notebook > header tab .titlebar button.titlebutton:last-child,
       .titlebar notebook > header tab button.titlebutton:last-child {
         margin-left: 4px;
         margin-right: -4px; }
-      notebook > header tab button.flat:first-child, notebook > header tab button.sidebar-button:first-child, notebook > header tab headerbar button.titlebutton:first-child, headerbar notebook > header tab button.titlebutton:first-child,
+      notebook > header tab button.flat:first-child, notebook > header tab notebook > header > tabs > arrow:first-child, notebook > header tab button.sidebar-button:first-child, notebook > header tab headerbar button.titlebutton:first-child, headerbar notebook > header tab button.titlebutton:first-child,
       notebook > header tab .titlebar button.titlebutton:first-child,
       .titlebar notebook > header tab button.titlebutton:first-child {
         margin-left: -4px;
@@ -2479,7 +2777,7 @@ switch {
 treeview.check {
   -gtk-icon-source: -gtk-scaled(url("assets/checkbox-unchecked.png"), url("assets/checkbox-unchecked@2.png"));
   -gtk-icon-shadow: 0 1px 0 rgba(255, 255, 255, 0.8); }
-  treeview.check button.flat, treeview.check button.sidebar-button, treeview.check headerbar button.titlebutton, headerbar treeview.check button.titlebutton,
+  treeview.check button.flat, treeview.check notebook > header > tabs > arrow, treeview.check button.sidebar-button, treeview.check headerbar button.titlebutton, headerbar treeview.check button.titlebutton,
   treeview.check .titlebar button.titlebutton,
   .titlebar treeview.check button.titlebutton {
     -gtk-icon-shadow: none; }
@@ -2490,7 +2788,7 @@ treeview.check {
 treeview.check:hover {
   -gtk-icon-source: -gtk-scaled(url("assets/checkbox-unchecked-hover.png"), url("assets/checkbox-unchecked-hover@2.png"));
   -gtk-icon-shadow: 0 1px 0 rgba(255, 255, 255, 0.8); }
-  treeview.check:hover button.flat, treeview.check:hover button.sidebar-button, treeview.check:hover headerbar button.titlebutton, headerbar treeview.check:hover button.titlebutton,
+  treeview.check:hover button.flat, treeview.check:hover notebook > header > tabs > arrow, treeview.check:hover button.sidebar-button, treeview.check:hover headerbar button.titlebutton, headerbar treeview.check:hover button.titlebutton,
   treeview.check:hover .titlebar button.titlebutton,
   .titlebar treeview.check:hover button.titlebutton {
     -gtk-icon-shadow: none; }
@@ -2501,7 +2799,7 @@ treeview.check:hover {
 treeview.check:active {
   -gtk-icon-source: -gtk-scaled(url("assets/checkbox-unchecked-active.png"), url("assets/checkbox-unchecked-active@2.png"));
   -gtk-icon-shadow: 0 1px 0 rgba(255, 255, 255, 0.8); }
-  treeview.check:active button.flat, treeview.check:active button.sidebar-button, treeview.check:active headerbar button.titlebutton, headerbar treeview.check:active button.titlebutton,
+  treeview.check:active button.flat, treeview.check:active notebook > header > tabs > arrow, treeview.check:active button.sidebar-button, treeview.check:active headerbar button.titlebutton, headerbar treeview.check:active button.titlebutton,
   treeview.check:active .titlebar button.titlebutton,
   .titlebar treeview.check:active button.titlebutton {
     -gtk-icon-shadow: none; }
@@ -2512,7 +2810,7 @@ treeview.check:active {
 treeview.check:disabled {
   -gtk-icon-source: -gtk-scaled(url("assets/checkbox-unchecked-insensitive.png"), url("assets/checkbox-unchecked-insensitive@2.png"));
   -gtk-icon-shadow: 0 1px 0 rgba(255, 255, 255, 0.8); }
-  treeview.check:disabled button.flat, treeview.check:disabled button.sidebar-button, treeview.check:disabled headerbar button.titlebutton, headerbar treeview.check:disabled button.titlebutton,
+  treeview.check:disabled button.flat, treeview.check:disabled notebook > header > tabs > arrow, treeview.check:disabled button.sidebar-button, treeview.check:disabled headerbar button.titlebutton, headerbar treeview.check:disabled button.titlebutton,
   treeview.check:disabled .titlebar button.titlebutton,
   .titlebar treeview.check:disabled button.titlebutton {
     -gtk-icon-shadow: none; }
@@ -2523,7 +2821,7 @@ treeview.check:disabled {
 treeview.check:backdrop {
   -gtk-icon-source: -gtk-scaled(url("assets/checkbox-unchecked-backdrop.png"), url("assets/checkbox-unchecked-backdrop@2.png"));
   -gtk-icon-shadow: none; }
-  treeview.check:backdrop button.flat, treeview.check:backdrop button.sidebar-button, treeview.check:backdrop headerbar button.titlebutton, headerbar treeview.check:backdrop button.titlebutton,
+  treeview.check:backdrop button.flat, treeview.check:backdrop notebook > header > tabs > arrow, treeview.check:backdrop button.sidebar-button, treeview.check:backdrop headerbar button.titlebutton, headerbar treeview.check:backdrop button.titlebutton,
   treeview.check:backdrop .titlebar button.titlebutton,
   .titlebar treeview.check:backdrop button.titlebutton {
     -gtk-icon-shadow: none; }
@@ -2534,7 +2832,7 @@ treeview.check:backdrop {
 treeview.check:backdrop:disabled {
   -gtk-icon-source: -gtk-scaled(url("assets/checkbox-unchecked-backdrop-insensitive.png"), url("assets/checkbox-unchecked-backdrop-insensitive@2.png"));
   -gtk-icon-shadow: none; }
-  treeview.check:backdrop:disabled button.flat, treeview.check:backdrop:disabled button.sidebar-button, treeview.check:backdrop:disabled headerbar button.titlebutton, headerbar treeview.check:backdrop:disabled button.titlebutton,
+  treeview.check:backdrop:disabled button.flat, treeview.check:backdrop:disabled notebook > header > tabs > arrow, treeview.check:backdrop:disabled button.sidebar-button, treeview.check:backdrop:disabled headerbar button.titlebutton, headerbar treeview.check:backdrop:disabled button.titlebutton,
   treeview.check:backdrop:disabled .titlebar button.titlebutton,
   .titlebar treeview.check:backdrop:disabled button.titlebutton {
     -gtk-icon-shadow: none; }
@@ -2545,7 +2843,7 @@ treeview.check:backdrop:disabled {
 treeview.check:indeterminate {
   -gtk-icon-source: -gtk-scaled(url("assets/checkbox-mixed.png"), url("assets/checkbox-mixed@2.png"));
   -gtk-icon-shadow: 0 1px 0 rgba(255, 255, 255, 0.8); }
-  treeview.check:indeterminate button.flat, treeview.check:indeterminate button.sidebar-button, treeview.check:indeterminate headerbar button.titlebutton, headerbar treeview.check:indeterminate button.titlebutton,
+  treeview.check:indeterminate button.flat, treeview.check:indeterminate notebook > header > tabs > arrow, treeview.check:indeterminate button.sidebar-button, treeview.check:indeterminate headerbar button.titlebutton, headerbar treeview.check:indeterminate button.titlebutton,
   treeview.check:indeterminate .titlebar button.titlebutton,
   .titlebar treeview.check:indeterminate button.titlebutton {
     -gtk-icon-shadow: none; }
@@ -2556,7 +2854,7 @@ treeview.check:indeterminate {
 treeview.check:indeterminate:hover {
   -gtk-icon-source: -gtk-scaled(url("assets/checkbox-mixed-hover.png"), url("assets/checkbox-mixed-hover@2.png"));
   -gtk-icon-shadow: 0 1px 0 rgba(255, 255, 255, 0.8); }
-  treeview.check:indeterminate:hover button.flat, treeview.check:indeterminate:hover button.sidebar-button, treeview.check:indeterminate:hover headerbar button.titlebutton, headerbar treeview.check:indeterminate:hover button.titlebutton,
+  treeview.check:indeterminate:hover button.flat, treeview.check:indeterminate:hover notebook > header > tabs > arrow, treeview.check:indeterminate:hover button.sidebar-button, treeview.check:indeterminate:hover headerbar button.titlebutton, headerbar treeview.check:indeterminate:hover button.titlebutton,
   treeview.check:indeterminate:hover .titlebar button.titlebutton,
   .titlebar treeview.check:indeterminate:hover button.titlebutton {
     -gtk-icon-shadow: none; }
@@ -2567,7 +2865,7 @@ treeview.check:indeterminate:hover {
 treeview.check:indeterminate:selected {
   -gtk-icon-source: -gtk-scaled(url("assets/checkbox-mixed-active.png"), url("assets/checkbox-mixed-active@2.png"));
   -gtk-icon-shadow: 0 1px 0 rgba(255, 255, 255, 0.8); }
-  treeview.check:indeterminate:selected button.flat, treeview.check:indeterminate:selected button.sidebar-button, treeview.check:indeterminate:selected headerbar button.titlebutton, headerbar treeview.check:indeterminate:selected button.titlebutton,
+  treeview.check:indeterminate:selected button.flat, treeview.check:indeterminate:selected notebook > header > tabs > arrow, treeview.check:indeterminate:selected button.sidebar-button, treeview.check:indeterminate:selected headerbar button.titlebutton, headerbar treeview.check:indeterminate:selected button.titlebutton,
   treeview.check:indeterminate:selected .titlebar button.titlebutton,
   .titlebar treeview.check:indeterminate:selected button.titlebutton {
     -gtk-icon-shadow: none; }
@@ -2578,7 +2876,7 @@ treeview.check:indeterminate:selected {
 treeview.check:indeterminate:backdrop {
   -gtk-icon-source: -gtk-scaled(url("assets/checkbox-mixed-backdrop.png"), url("assets/checkbox-mixed-backdrop@2.png"));
   -gtk-icon-shadow: none; }
-  treeview.check:indeterminate:backdrop button.flat, treeview.check:indeterminate:backdrop button.sidebar-button, treeview.check:indeterminate:backdrop headerbar button.titlebutton, headerbar treeview.check:indeterminate:backdrop button.titlebutton,
+  treeview.check:indeterminate:backdrop button.flat, treeview.check:indeterminate:backdrop notebook > header > tabs > arrow, treeview.check:indeterminate:backdrop button.sidebar-button, treeview.check:indeterminate:backdrop headerbar button.titlebutton, headerbar treeview.check:indeterminate:backdrop button.titlebutton,
   treeview.check:indeterminate:backdrop .titlebar button.titlebutton,
   .titlebar treeview.check:indeterminate:backdrop button.titlebutton {
     -gtk-icon-shadow: none; }
@@ -2589,7 +2887,7 @@ treeview.check:indeterminate:backdrop {
 treeview.check:indeterminate:disabled {
   -gtk-icon-source: -gtk-scaled(url("assets/checkbox-mixed-insensitive.png"), url("assets/checkbox-mixed-insensitive@2.png"));
   -gtk-icon-shadow: 0 1px 0 rgba(255, 255, 255, 0.8); }
-  treeview.check:indeterminate:disabled button.flat, treeview.check:indeterminate:disabled button.sidebar-button, treeview.check:indeterminate:disabled headerbar button.titlebutton, headerbar treeview.check:indeterminate:disabled button.titlebutton,
+  treeview.check:indeterminate:disabled button.flat, treeview.check:indeterminate:disabled notebook > header > tabs > arrow, treeview.check:indeterminate:disabled button.sidebar-button, treeview.check:indeterminate:disabled headerbar button.titlebutton, headerbar treeview.check:indeterminate:disabled button.titlebutton,
   treeview.check:indeterminate:disabled .titlebar button.titlebutton,
   .titlebar treeview.check:indeterminate:disabled button.titlebutton {
     -gtk-icon-shadow: none; }
@@ -2600,7 +2898,7 @@ treeview.check:indeterminate:disabled {
 treeview.check:indeterminate:disabled:backdrop {
   -gtk-icon-source: -gtk-scaled(url("assets/checkbox-mixed-backdrop-insensitive.png"), url("assets/checkbox-mixed-backdrop-insensitive@2.png"));
   -gtk-icon-shadow: none; }
-  treeview.check:indeterminate:disabled:backdrop button.flat, treeview.check:indeterminate:disabled:backdrop button.sidebar-button, treeview.check:indeterminate:disabled:backdrop headerbar button.titlebutton, headerbar treeview.check:indeterminate:disabled:backdrop button.titlebutton,
+  treeview.check:indeterminate:disabled:backdrop button.flat, treeview.check:indeterminate:disabled:backdrop notebook > header > tabs > arrow, treeview.check:indeterminate:disabled:backdrop button.sidebar-button, treeview.check:indeterminate:disabled:backdrop headerbar button.titlebutton, headerbar treeview.check:indeterminate:disabled:backdrop button.titlebutton,
   treeview.check:indeterminate:disabled:backdrop .titlebar button.titlebutton,
   .titlebar treeview.check:indeterminate:disabled:backdrop button.titlebutton {
     -gtk-icon-shadow: none; }
@@ -2611,7 +2909,7 @@ treeview.check:indeterminate:disabled:backdrop {
 treeview.check:checked {
   -gtk-icon-source: -gtk-scaled(url("assets/checkbox-checked.png"), url("assets/checkbox-checked@2.png"));
   -gtk-icon-shadow: 0 1px 0 rgba(255, 255, 255, 0.8); }
-  treeview.check:checked button.flat, treeview.check:checked button.sidebar-button, treeview.check:checked headerbar button.titlebutton, headerbar treeview.check:checked button.titlebutton,
+  treeview.check:checked button.flat, treeview.check:checked notebook > header > tabs > arrow, treeview.check:checked button.sidebar-button, treeview.check:checked headerbar button.titlebutton, headerbar treeview.check:checked button.titlebutton,
   treeview.check:checked .titlebar button.titlebutton,
   .titlebar treeview.check:checked button.titlebutton {
     -gtk-icon-shadow: none; }
@@ -2622,7 +2920,7 @@ treeview.check:checked {
 treeview.check:checked:disabled {
   -gtk-icon-source: -gtk-scaled(url("assets/checkbox-checked-insensitive.png"), url("assets/checkbox-checked-insensitive@2.png"));
   -gtk-icon-shadow: 0 1px 0 rgba(255, 255, 255, 0.8); }
-  treeview.check:checked:disabled button.flat, treeview.check:checked:disabled button.sidebar-button, treeview.check:checked:disabled headerbar button.titlebutton, headerbar treeview.check:checked:disabled button.titlebutton,
+  treeview.check:checked:disabled button.flat, treeview.check:checked:disabled notebook > header > tabs > arrow, treeview.check:checked:disabled button.sidebar-button, treeview.check:checked:disabled headerbar button.titlebutton, headerbar treeview.check:checked:disabled button.titlebutton,
   treeview.check:checked:disabled .titlebar button.titlebutton,
   .titlebar treeview.check:checked:disabled button.titlebutton {
     -gtk-icon-shadow: none; }
@@ -2633,7 +2931,7 @@ treeview.check:checked:disabled {
 treeview.check:checked:hover {
   -gtk-icon-source: -gtk-scaled(url("assets/checkbox-checked-hover.png"), url("assets/checkbox-checked-hover@2.png"));
   -gtk-icon-shadow: 0 1px 0 rgba(255, 255, 255, 0.8); }
-  treeview.check:checked:hover button.flat, treeview.check:checked:hover button.sidebar-button, treeview.check:checked:hover headerbar button.titlebutton, headerbar treeview.check:checked:hover button.titlebutton,
+  treeview.check:checked:hover button.flat, treeview.check:checked:hover notebook > header > tabs > arrow, treeview.check:checked:hover button.sidebar-button, treeview.check:checked:hover headerbar button.titlebutton, headerbar treeview.check:checked:hover button.titlebutton,
   treeview.check:checked:hover .titlebar button.titlebutton,
   .titlebar treeview.check:checked:hover button.titlebutton {
     -gtk-icon-shadow: none; }
@@ -2644,7 +2942,7 @@ treeview.check:checked:hover {
 treeview.check:checked:active {
   -gtk-icon-source: -gtk-scaled(url("assets/checkbox-checked-active.png"), url("assets/checkbox-checked-active@2.png"));
   -gtk-icon-shadow: 0 1px 0 rgba(255, 255, 255, 0.8); }
-  treeview.check:checked:active button.flat, treeview.check:checked:active button.sidebar-button, treeview.check:checked:active headerbar button.titlebutton, headerbar treeview.check:checked:active button.titlebutton,
+  treeview.check:checked:active button.flat, treeview.check:checked:active notebook > header > tabs > arrow, treeview.check:checked:active button.sidebar-button, treeview.check:checked:active headerbar button.titlebutton, headerbar treeview.check:checked:active button.titlebutton,
   treeview.check:checked:active .titlebar button.titlebutton,
   .titlebar treeview.check:checked:active button.titlebutton {
     -gtk-icon-shadow: none; }
@@ -2655,7 +2953,7 @@ treeview.check:checked:active {
 treeview.check:backdrop:checked {
   -gtk-icon-source: -gtk-scaled(url("assets/checkbox-checked-backdrop.png"), url("assets/checkbox-checked-backdrop@2.png"));
   -gtk-icon-shadow: none; }
-  treeview.check:backdrop:checked button.flat, treeview.check:backdrop:checked button.sidebar-button, treeview.check:backdrop:checked headerbar button.titlebutton, headerbar treeview.check:backdrop:checked button.titlebutton,
+  treeview.check:backdrop:checked button.flat, treeview.check:backdrop:checked notebook > header > tabs > arrow, treeview.check:backdrop:checked button.sidebar-button, treeview.check:backdrop:checked headerbar button.titlebutton, headerbar treeview.check:backdrop:checked button.titlebutton,
   treeview.check:backdrop:checked .titlebar button.titlebutton,
   .titlebar treeview.check:backdrop:checked button.titlebutton {
     -gtk-icon-shadow: none; }
@@ -2666,7 +2964,7 @@ treeview.check:backdrop:checked {
 treeview.check:backdrop:checked:disabled {
   -gtk-icon-source: -gtk-scaled(url("assets/checkbox-checked-backdrop-insensitive.png"), url("assets/checkbox-checked-backdrop-insensitive@2.png"));
   -gtk-icon-shadow: none; }
-  treeview.check:backdrop:checked:disabled button.flat, treeview.check:backdrop:checked:disabled button.sidebar-button, treeview.check:backdrop:checked:disabled headerbar button.titlebutton, headerbar treeview.check:backdrop:checked:disabled button.titlebutton,
+  treeview.check:backdrop:checked:disabled button.flat, treeview.check:backdrop:checked:disabled notebook > header > tabs > arrow, treeview.check:backdrop:checked:disabled button.sidebar-button, treeview.check:backdrop:checked:disabled headerbar button.titlebutton, headerbar treeview.check:backdrop:checked:disabled button.titlebutton,
   treeview.check:backdrop:checked:disabled .titlebar button.titlebutton,
   .titlebar treeview.check:backdrop:checked:disabled button.titlebutton {
     -gtk-icon-shadow: none; }
@@ -2677,7 +2975,7 @@ treeview.check:backdrop:checked:disabled {
 treeview.radio {
   -gtk-icon-source: -gtk-scaled(url("assets/radio-unchecked.png"), url("assets/radio-unchecked@2.png"));
   -gtk-icon-shadow: 0 1px 0 rgba(255, 255, 255, 0.8); }
-  treeview.radio button.flat, treeview.radio button.sidebar-button, treeview.radio headerbar button.titlebutton, headerbar treeview.radio button.titlebutton,
+  treeview.radio button.flat, treeview.radio notebook > header > tabs > arrow, treeview.radio button.sidebar-button, treeview.radio headerbar button.titlebutton, headerbar treeview.radio button.titlebutton,
   treeview.radio .titlebar button.titlebutton,
   .titlebar treeview.radio button.titlebutton {
     -gtk-icon-shadow: none; }
@@ -2688,7 +2986,7 @@ treeview.radio {
 treeview.radio:hover {
   -gtk-icon-source: -gtk-scaled(url("assets/radio-unchecked-hover.png"), url("assets/radio-unchecked-hover@2.png"));
   -gtk-icon-shadow: 0 1px 0 rgba(255, 255, 255, 0.8); }
-  treeview.radio:hover button.flat, treeview.radio:hover button.sidebar-button, treeview.radio:hover headerbar button.titlebutton, headerbar treeview.radio:hover button.titlebutton,
+  treeview.radio:hover button.flat, treeview.radio:hover notebook > header > tabs > arrow, treeview.radio:hover button.sidebar-button, treeview.radio:hover headerbar button.titlebutton, headerbar treeview.radio:hover button.titlebutton,
   treeview.radio:hover .titlebar button.titlebutton,
   .titlebar treeview.radio:hover button.titlebutton {
     -gtk-icon-shadow: none; }
@@ -2699,7 +2997,7 @@ treeview.radio:hover {
 treeview.radio:active {
   -gtk-icon-source: -gtk-scaled(url("assets/radio-unchecked-active.png"), url("assets/radio-unchecked-active@2.png"));
   -gtk-icon-shadow: 0 1px 0 rgba(255, 255, 255, 0.8); }
-  treeview.radio:active button.flat, treeview.radio:active button.sidebar-button, treeview.radio:active headerbar button.titlebutton, headerbar treeview.radio:active button.titlebutton,
+  treeview.radio:active button.flat, treeview.radio:active notebook > header > tabs > arrow, treeview.radio:active button.sidebar-button, treeview.radio:active headerbar button.titlebutton, headerbar treeview.radio:active button.titlebutton,
   treeview.radio:active .titlebar button.titlebutton,
   .titlebar treeview.radio:active button.titlebutton {
     -gtk-icon-shadow: none; }
@@ -2710,7 +3008,7 @@ treeview.radio:active {
 treeview.radio:disabled {
   -gtk-icon-source: -gtk-scaled(url("assets/radio-unchecked-insensitive.png"), url("assets/radio-unchecked-insensitive@2.png"));
   -gtk-icon-shadow: 0 1px 0 rgba(255, 255, 255, 0.8); }
-  treeview.radio:disabled button.flat, treeview.radio:disabled button.sidebar-button, treeview.radio:disabled headerbar button.titlebutton, headerbar treeview.radio:disabled button.titlebutton,
+  treeview.radio:disabled button.flat, treeview.radio:disabled notebook > header > tabs > arrow, treeview.radio:disabled button.sidebar-button, treeview.radio:disabled headerbar button.titlebutton, headerbar treeview.radio:disabled button.titlebutton,
   treeview.radio:disabled .titlebar button.titlebutton,
   .titlebar treeview.radio:disabled button.titlebutton {
     -gtk-icon-shadow: none; }
@@ -2721,7 +3019,7 @@ treeview.radio:disabled {
 treeview.radio:backdrop {
   -gtk-icon-source: -gtk-scaled(url("assets/radio-unchecked-backdrop.png"), url("assets/radio-unchecked-backdrop@2.png"));
   -gtk-icon-shadow: none; }
-  treeview.radio:backdrop button.flat, treeview.radio:backdrop button.sidebar-button, treeview.radio:backdrop headerbar button.titlebutton, headerbar treeview.radio:backdrop button.titlebutton,
+  treeview.radio:backdrop button.flat, treeview.radio:backdrop notebook > header > tabs > arrow, treeview.radio:backdrop button.sidebar-button, treeview.radio:backdrop headerbar button.titlebutton, headerbar treeview.radio:backdrop button.titlebutton,
   treeview.radio:backdrop .titlebar button.titlebutton,
   .titlebar treeview.radio:backdrop button.titlebutton {
     -gtk-icon-shadow: none; }
@@ -2732,7 +3030,7 @@ treeview.radio:backdrop {
 treeview.radio:backdrop:disabled {
   -gtk-icon-source: -gtk-scaled(url("assets/radio-unchecked-backdrop-insensitive.png"), url("assets/radio-unchecked-backdrop-insensitive@2.png"));
   -gtk-icon-shadow: none; }
-  treeview.radio:backdrop:disabled button.flat, treeview.radio:backdrop:disabled button.sidebar-button, treeview.radio:backdrop:disabled headerbar button.titlebutton, headerbar treeview.radio:backdrop:disabled button.titlebutton,
+  treeview.radio:backdrop:disabled button.flat, treeview.radio:backdrop:disabled notebook > header > tabs > arrow, treeview.radio:backdrop:disabled button.sidebar-button, treeview.radio:backdrop:disabled headerbar button.titlebutton, headerbar treeview.radio:backdrop:disabled button.titlebutton,
   treeview.radio:backdrop:disabled .titlebar button.titlebutton,
   .titlebar treeview.radio:backdrop:disabled button.titlebutton {
     -gtk-icon-shadow: none; }
@@ -2743,7 +3041,7 @@ treeview.radio:backdrop:disabled {
 treeview.radio:indeterminate {
   -gtk-icon-source: -gtk-scaled(url("assets/radio-mixed.png"), url("assets/radio-mixed@2.png"));
   -gtk-icon-shadow: 0 1px 0 rgba(255, 255, 255, 0.8); }
-  treeview.radio:indeterminate button.flat, treeview.radio:indeterminate button.sidebar-button, treeview.radio:indeterminate headerbar button.titlebutton, headerbar treeview.radio:indeterminate button.titlebutton,
+  treeview.radio:indeterminate button.flat, treeview.radio:indeterminate notebook > header > tabs > arrow, treeview.radio:indeterminate button.sidebar-button, treeview.radio:indeterminate headerbar button.titlebutton, headerbar treeview.radio:indeterminate button.titlebutton,
   treeview.radio:indeterminate .titlebar button.titlebutton,
   .titlebar treeview.radio:indeterminate button.titlebutton {
     -gtk-icon-shadow: none; }
@@ -2754,7 +3052,7 @@ treeview.radio:indeterminate {
 treeview.radio:indeterminate:hover {
   -gtk-icon-source: -gtk-scaled(url("assets/radio-mixed-hover.png"), url("assets/radio-mixed-hover@2.png"));
   -gtk-icon-shadow: 0 1px 0 rgba(255, 255, 255, 0.8); }
-  treeview.radio:indeterminate:hover button.flat, treeview.radio:indeterminate:hover button.sidebar-button, treeview.radio:indeterminate:hover headerbar button.titlebutton, headerbar treeview.radio:indeterminate:hover button.titlebutton,
+  treeview.radio:indeterminate:hover button.flat, treeview.radio:indeterminate:hover notebook > header > tabs > arrow, treeview.radio:indeterminate:hover button.sidebar-button, treeview.radio:indeterminate:hover headerbar button.titlebutton, headerbar treeview.radio:indeterminate:hover button.titlebutton,
   treeview.radio:indeterminate:hover .titlebar button.titlebutton,
   .titlebar treeview.radio:indeterminate:hover button.titlebutton {
     -gtk-icon-shadow: none; }
@@ -2765,7 +3063,7 @@ treeview.radio:indeterminate:hover {
 treeview.radio:indeterminate:selected {
   -gtk-icon-source: -gtk-scaled(url("assets/radio-mixed-active.png"), url("assets/radio-mixed-active@2.png"));
   -gtk-icon-shadow: 0 1px 0 rgba(255, 255, 255, 0.8); }
-  treeview.radio:indeterminate:selected button.flat, treeview.radio:indeterminate:selected button.sidebar-button, treeview.radio:indeterminate:selected headerbar button.titlebutton, headerbar treeview.radio:indeterminate:selected button.titlebutton,
+  treeview.radio:indeterminate:selected button.flat, treeview.radio:indeterminate:selected notebook > header > tabs > arrow, treeview.radio:indeterminate:selected button.sidebar-button, treeview.radio:indeterminate:selected headerbar button.titlebutton, headerbar treeview.radio:indeterminate:selected button.titlebutton,
   treeview.radio:indeterminate:selected .titlebar button.titlebutton,
   .titlebar treeview.radio:indeterminate:selected button.titlebutton {
     -gtk-icon-shadow: none; }
@@ -2776,7 +3074,7 @@ treeview.radio:indeterminate:selected {
 treeview.radio:indeterminate:backdrop {
   -gtk-icon-source: -gtk-scaled(url("assets/radio-mixed-backdrop.png"), url("assets/radio-mixed-backdrop@2.png"));
   -gtk-icon-shadow: none; }
-  treeview.radio:indeterminate:backdrop button.flat, treeview.radio:indeterminate:backdrop button.sidebar-button, treeview.radio:indeterminate:backdrop headerbar button.titlebutton, headerbar treeview.radio:indeterminate:backdrop button.titlebutton,
+  treeview.radio:indeterminate:backdrop button.flat, treeview.radio:indeterminate:backdrop notebook > header > tabs > arrow, treeview.radio:indeterminate:backdrop button.sidebar-button, treeview.radio:indeterminate:backdrop headerbar button.titlebutton, headerbar treeview.radio:indeterminate:backdrop button.titlebutton,
   treeview.radio:indeterminate:backdrop .titlebar button.titlebutton,
   .titlebar treeview.radio:indeterminate:backdrop button.titlebutton {
     -gtk-icon-shadow: none; }
@@ -2787,7 +3085,7 @@ treeview.radio:indeterminate:backdrop {
 treeview.radio:indeterminate:disabled {
   -gtk-icon-source: -gtk-scaled(url("assets/radio-mixed-insensitive.png"), url("assets/radio-mixed-insensitive@2.png"));
   -gtk-icon-shadow: 0 1px 0 rgba(255, 255, 255, 0.8); }
-  treeview.radio:indeterminate:disabled button.flat, treeview.radio:indeterminate:disabled button.sidebar-button, treeview.radio:indeterminate:disabled headerbar button.titlebutton, headerbar treeview.radio:indeterminate:disabled button.titlebutton,
+  treeview.radio:indeterminate:disabled button.flat, treeview.radio:indeterminate:disabled notebook > header > tabs > arrow, treeview.radio:indeterminate:disabled button.sidebar-button, treeview.radio:indeterminate:disabled headerbar button.titlebutton, headerbar treeview.radio:indeterminate:disabled button.titlebutton,
   treeview.radio:indeterminate:disabled .titlebar button.titlebutton,
   .titlebar treeview.radio:indeterminate:disabled button.titlebutton {
     -gtk-icon-shadow: none; }
@@ -2798,7 +3096,7 @@ treeview.radio:indeterminate:disabled {
 treeview.radio:indeterminate:disabled:backdrop {
   -gtk-icon-source: -gtk-scaled(url("assets/radio-mixed-backdrop-insensitive.png"), url("assets/radio-mixed-backdrop-insensitive@2.png"));
   -gtk-icon-shadow: none; }
-  treeview.radio:indeterminate:disabled:backdrop button.flat, treeview.radio:indeterminate:disabled:backdrop button.sidebar-button, treeview.radio:indeterminate:disabled:backdrop headerbar button.titlebutton, headerbar treeview.radio:indeterminate:disabled:backdrop button.titlebutton,
+  treeview.radio:indeterminate:disabled:backdrop button.flat, treeview.radio:indeterminate:disabled:backdrop notebook > header > tabs > arrow, treeview.radio:indeterminate:disabled:backdrop button.sidebar-button, treeview.radio:indeterminate:disabled:backdrop headerbar button.titlebutton, headerbar treeview.radio:indeterminate:disabled:backdrop button.titlebutton,
   treeview.radio:indeterminate:disabled:backdrop .titlebar button.titlebutton,
   .titlebar treeview.radio:indeterminate:disabled:backdrop button.titlebutton {
     -gtk-icon-shadow: none; }
@@ -2809,7 +3107,7 @@ treeview.radio:indeterminate:disabled:backdrop {
 treeview.radio:checked {
   -gtk-icon-source: -gtk-scaled(url("assets/radio-checked.png"), url("assets/radio-checked@2.png"));
   -gtk-icon-shadow: 0 1px 0 rgba(255, 255, 255, 0.8); }
-  treeview.radio:checked button.flat, treeview.radio:checked button.sidebar-button, treeview.radio:checked headerbar button.titlebutton, headerbar treeview.radio:checked button.titlebutton,
+  treeview.radio:checked button.flat, treeview.radio:checked notebook > header > tabs > arrow, treeview.radio:checked button.sidebar-button, treeview.radio:checked headerbar button.titlebutton, headerbar treeview.radio:checked button.titlebutton,
   treeview.radio:checked .titlebar button.titlebutton,
   .titlebar treeview.radio:checked button.titlebutton {
     -gtk-icon-shadow: none; }
@@ -2820,7 +3118,7 @@ treeview.radio:checked {
 treeview.radio:checked:disabled {
   -gtk-icon-source: -gtk-scaled(url("assets/radio-checked-insensitive.png"), url("assets/radio-checked-insensitive@2.png"));
   -gtk-icon-shadow: 0 1px 0 rgba(255, 255, 255, 0.8); }
-  treeview.radio:checked:disabled button.flat, treeview.radio:checked:disabled button.sidebar-button, treeview.radio:checked:disabled headerbar button.titlebutton, headerbar treeview.radio:checked:disabled button.titlebutton,
+  treeview.radio:checked:disabled button.flat, treeview.radio:checked:disabled notebook > header > tabs > arrow, treeview.radio:checked:disabled button.sidebar-button, treeview.radio:checked:disabled headerbar button.titlebutton, headerbar treeview.radio:checked:disabled button.titlebutton,
   treeview.radio:checked:disabled .titlebar button.titlebutton,
   .titlebar treeview.radio:checked:disabled button.titlebutton {
     -gtk-icon-shadow: none; }
@@ -2831,7 +3129,7 @@ treeview.radio:checked:disabled {
 treeview.radio:checked:hover {
   -gtk-icon-source: -gtk-scaled(url("assets/radio-checked-hover.png"), url("assets/radio-checked-hover@2.png"));
   -gtk-icon-shadow: 0 1px 0 rgba(255, 255, 255, 0.8); }
-  treeview.radio:checked:hover button.flat, treeview.radio:checked:hover button.sidebar-button, treeview.radio:checked:hover headerbar button.titlebutton, headerbar treeview.radio:checked:hover button.titlebutton,
+  treeview.radio:checked:hover button.flat, treeview.radio:checked:hover notebook > header > tabs > arrow, treeview.radio:checked:hover button.sidebar-button, treeview.radio:checked:hover headerbar button.titlebutton, headerbar treeview.radio:checked:hover button.titlebutton,
   treeview.radio:checked:hover .titlebar button.titlebutton,
   .titlebar treeview.radio:checked:hover button.titlebutton {
     -gtk-icon-shadow: none; }
@@ -2842,7 +3140,7 @@ treeview.radio:checked:hover {
 treeview.radio:checked:active {
   -gtk-icon-source: -gtk-scaled(url("assets/radio-checked-active.png"), url("assets/radio-checked-active@2.png"));
   -gtk-icon-shadow: 0 1px 0 rgba(255, 255, 255, 0.8); }
-  treeview.radio:checked:active button.flat, treeview.radio:checked:active button.sidebar-button, treeview.radio:checked:active headerbar button.titlebutton, headerbar treeview.radio:checked:active button.titlebutton,
+  treeview.radio:checked:active button.flat, treeview.radio:checked:active notebook > header > tabs > arrow, treeview.radio:checked:active button.sidebar-button, treeview.radio:checked:active headerbar button.titlebutton, headerbar treeview.radio:checked:active button.titlebutton,
   treeview.radio:checked:active .titlebar button.titlebutton,
   .titlebar treeview.radio:checked:active button.titlebutton {
     -gtk-icon-shadow: none; }
@@ -2853,7 +3151,7 @@ treeview.radio:checked:active {
 treeview.radio:backdrop:checked {
   -gtk-icon-source: -gtk-scaled(url("assets/radio-checked-backdrop.png"), url("assets/radio-checked-backdrop@2.png"));
   -gtk-icon-shadow: none; }
-  treeview.radio:backdrop:checked button.flat, treeview.radio:backdrop:checked button.sidebar-button, treeview.radio:backdrop:checked headerbar button.titlebutton, headerbar treeview.radio:backdrop:checked button.titlebutton,
+  treeview.radio:backdrop:checked button.flat, treeview.radio:backdrop:checked notebook > header > tabs > arrow, treeview.radio:backdrop:checked button.sidebar-button, treeview.radio:backdrop:checked headerbar button.titlebutton, headerbar treeview.radio:backdrop:checked button.titlebutton,
   treeview.radio:backdrop:checked .titlebar button.titlebutton,
   .titlebar treeview.radio:backdrop:checked button.titlebutton {
     -gtk-icon-shadow: none; }
@@ -2864,7 +3162,7 @@ treeview.radio:backdrop:checked {
 treeview.radio:backdrop:checked:disabled {
   -gtk-icon-source: -gtk-scaled(url("assets/radio-checked-backdrop-insensitive.png"), url("assets/radio-checked-backdrop-insensitive@2.png"));
   -gtk-icon-shadow: none; }
-  treeview.radio:backdrop:checked:disabled button.flat, treeview.radio:backdrop:checked:disabled button.sidebar-button, treeview.radio:backdrop:checked:disabled headerbar button.titlebutton, headerbar treeview.radio:backdrop:checked:disabled button.titlebutton,
+  treeview.radio:backdrop:checked:disabled button.flat, treeview.radio:backdrop:checked:disabled notebook > header > tabs > arrow, treeview.radio:backdrop:checked:disabled button.sidebar-button, treeview.radio:backdrop:checked:disabled headerbar button.titlebutton, headerbar treeview.radio:backdrop:checked:disabled button.titlebutton,
   treeview.radio:backdrop:checked:disabled .titlebar button.titlebutton,
   .titlebar treeview.radio:backdrop:checked:disabled button.titlebutton {
     -gtk-icon-shadow: none; }
@@ -3763,7 +4061,7 @@ row:selected .titlebar button.titlebutton,
   -gtk-icon-shadow: 0 1px rgba(255, 255, 255, 0.76923);
   box-shadow: inset 0 1px rgba(255, 255, 255, 0.8);
   border-color: #184472; }
-  row:selected button.flat, row:selected button.sidebar-button, row:selected headerbar button.titlebutton, headerbar row:selected button.titlebutton,
+  row:selected button.flat, row:selected notebook > header > tabs > arrow, row:selected button.sidebar-button, row:selected headerbar button.titlebutton, headerbar row:selected button.titlebutton,
   row:selected .titlebar button.titlebutton,
   .titlebar row:selected button.titlebutton {
     border-color: transparent;
@@ -3797,7 +4095,7 @@ row:selected .titlebar button.titlebutton,
     -gtk-icon-shadow: 0 1px rgba(255, 255, 255, 0.76923);
     box-shadow: inset 0 2px 1px -2px rgba(0, 0, 0, 0.6);
     border-color: #184472; }
-  row:selected button:backdrop, row:selected button.flat:backdrop, row:selected button.sidebar-button:backdrop, row:selected headerbar button.titlebutton:backdrop, headerbar row:selected button.titlebutton:backdrop,
+  row:selected button:backdrop, row:selected button.flat:backdrop, row:selected notebook > header > tabs > arrow:backdrop, row:selected button.sidebar-button:backdrop, row:selected headerbar button.titlebutton:backdrop, headerbar row:selected button.titlebutton:backdrop,
   row:selected .titlebar button.titlebutton:backdrop,
   .titlebar row:selected button.titlebutton:backdrop {
     color: #8b8e8f;
@@ -3807,9 +4105,9 @@ row:selected .titlebar button.titlebutton,
     -gtk-icon-shadow: none;
     box-shadow: inset 0 1px rgba(255, 255, 255, 0);
     border-color: #184472; }
-    row:selected button:backdrop:active, row:selected button:backdrop:checked, row:selected button.flat:backdrop:active, row:selected button.sidebar-button:backdrop:active, row:selected headerbar button.titlebutton:backdrop:active, headerbar row:selected button.titlebutton:backdrop:active,
+    row:selected button:backdrop:active, row:selected button:backdrop:checked, row:selected button.flat:backdrop:active, row:selected notebook > header > tabs > arrow:backdrop:active, row:selected button.sidebar-button:backdrop:active, row:selected headerbar button.titlebutton:backdrop:active, headerbar row:selected button.titlebutton:backdrop:active,
     row:selected .titlebar button.titlebutton:backdrop:active,
-    .titlebar row:selected button.titlebutton:backdrop:active, row:selected button.flat:backdrop:checked, row:selected button.sidebar-button:backdrop:checked, row:selected headerbar button.titlebutton:backdrop:checked, headerbar row:selected button.titlebutton:backdrop:checked,
+    .titlebar row:selected button.titlebutton:backdrop:active, row:selected button.flat:backdrop:checked, row:selected notebook > header > tabs > arrow:backdrop:checked, row:selected button.sidebar-button:backdrop:checked, row:selected headerbar button.titlebutton:backdrop:checked, headerbar row:selected button.titlebutton:backdrop:checked,
     row:selected .titlebar button.titlebutton:backdrop:checked,
     .titlebar row:selected button.titlebutton:backdrop:checked {
       color: #8b8e8f;
@@ -3817,7 +4115,7 @@ row:selected .titlebar button.titlebutton,
       background-image: linear-gradient(to bottom, #d1d1cf);
       box-shadow: inset 0 1px rgba(255, 255, 255, 0);
       border-color: #184472; }
-    row:selected button:backdrop:disabled, row:selected button.flat:backdrop:disabled, row:selected button.sidebar-button:backdrop:disabled, row:selected headerbar button.titlebutton:backdrop:disabled, headerbar row:selected button.titlebutton:backdrop:disabled,
+    row:selected button:backdrop:disabled, row:selected button.flat:backdrop:disabled, row:selected notebook > header > tabs > arrow:backdrop:disabled, row:selected button.sidebar-button:backdrop:disabled, row:selected headerbar button.titlebutton:backdrop:disabled, headerbar row:selected button.titlebutton:backdrop:disabled,
     row:selected .titlebar button.titlebutton:backdrop:disabled,
     .titlebar row:selected button.titlebutton:backdrop:disabled {
       color: #c3c3c0;
@@ -3827,9 +4125,9 @@ row:selected .titlebar button.titlebutton,
       -gtk-icon-shadow: none;
       box-shadow: inset 0 1px rgba(255, 255, 255, 0);
       border-color: #184472; }
-      row:selected button:backdrop:disabled:active, row:selected button:backdrop:disabled:checked, row:selected button.flat:backdrop:disabled:active, row:selected button.sidebar-button:backdrop:disabled:active, row:selected headerbar button.titlebutton:backdrop:disabled:active, headerbar row:selected button.titlebutton:backdrop:disabled:active,
+      row:selected button:backdrop:disabled:active, row:selected button:backdrop:disabled:checked, row:selected button.flat:backdrop:disabled:active, row:selected notebook > header > tabs > arrow:backdrop:disabled:active, row:selected button.sidebar-button:backdrop:disabled:active, row:selected headerbar button.titlebutton:backdrop:disabled:active, headerbar row:selected button.titlebutton:backdrop:disabled:active,
       row:selected .titlebar button.titlebutton:backdrop:disabled:active,
-      .titlebar row:selected button.titlebutton:backdrop:disabled:active, row:selected button.flat:backdrop:disabled:checked, row:selected button.sidebar-button:backdrop:disabled:checked, row:selected headerbar button.titlebutton:backdrop:disabled:checked, headerbar row:selected button.titlebutton:backdrop:disabled:checked,
+      .titlebar row:selected button.titlebutton:backdrop:disabled:active, row:selected button.flat:backdrop:disabled:checked, row:selected notebook > header > tabs > arrow:backdrop:disabled:checked, row:selected button.sidebar-button:backdrop:disabled:checked, row:selected headerbar button.titlebutton:backdrop:disabled:checked, headerbar row:selected button.titlebutton:backdrop:disabled:checked,
       row:selected .titlebar button.titlebutton:backdrop:disabled:checked,
       .titlebar row:selected button.titlebutton:backdrop:disabled:checked {
         color: #c3c3c0;
@@ -3837,7 +4135,7 @@ row:selected .titlebar button.titlebutton,
         background-image: linear-gradient(to bottom, #e4e4e4);
         box-shadow: inset 0 1px rgba(255, 255, 255, 0);
         border-color: #184472; }
-  row:selected button.flat:backdrop, row:selected button.sidebar-button:backdrop, row:selected headerbar button.titlebutton:backdrop, headerbar row:selected button.titlebutton:backdrop,
+  row:selected button.flat:backdrop, row:selected notebook > header > tabs > arrow:backdrop, row:selected button.sidebar-button:backdrop, row:selected headerbar button.titlebutton:backdrop, headerbar row:selected button.titlebutton:backdrop,
   row:selected .titlebar button.titlebutton:backdrop,
   .titlebar row:selected button.titlebutton:backdrop {
     border-color: transparent;
@@ -4455,7 +4753,7 @@ colorswatch#editor-color-sample {
   .content-view:backdrop {
     background-color: #d7d7d5; }
 
-.osd .scale-popup button.flat, .osd .scale-popup button.sidebar-button, .osd .scale-popup headerbar button.titlebutton, headerbar .osd .scale-popup button.titlebutton,
+.osd .scale-popup button.flat, .osd .scale-popup notebook > header > tabs > arrow, .osd .scale-popup button.sidebar-button, .osd .scale-popup headerbar button.titlebutton, headerbar .osd .scale-popup button.titlebutton,
 .osd .scale-popup .titlebar button.titlebutton,
 .titlebar .osd .scale-popup button.titlebutton {
   padding: 6px;