The way it currently exists is awkward and not how most virtual buttons
work. This patch causes the "clicked" look to occur when the button is held.
https://bugzilla.gnome.org/show_bug.cgi?id=692319
color: white;
}
-.show-apps:checked > .overview-icon {
+.show-apps:checked > .overview-icon,
+.show-apps:active > .overview-icon {
background-gradient-start: rgba(255, 255, 255, .05);
background-gradient-end: rgba(255, 255, 255, .15);
background-gradient-direction: vertical;