diff --git a/res/layout/activity_custom_theme.xml b/res/layout/activity_custom_theme.xml
index b2aaa73..24d58b7 100644
--- a/res/layout/activity_custom_theme.xml
+++ b/res/layout/activity_custom_theme.xml
@@ -33,7 +33,8 @@
         android:id="@+id/custom_theme_nav"
         android:layout_width="match_parent"
         android:layout_height="@dimen/custom_theme_nav_height"
-        android:layout_marginHorizontal="12dp">
+        android:paddingHorizontal="12dp"
+        android:background="?android:colorPrimary">
         <Button
             android:id="@+id/previous_button"
             style="@style/ActionSecondaryButton"