Use similar margins in the Credits and System tabs.
<child>
<object class="GtkTextView" id="system_view">
<property name="editable">0</property>
- <property name="left-margin">8</property>
- <property name="right-margin">8</property>
+ <property name="left-margin">5</property>
+ <property name="right-margin">5</property>
+ <property name="top-margin">5</property>
+ <property name="bottom-margin">5</property>
<property name="cursor-visible">0</property>
<child>
<object class="GtkGestureClick">