layout, fix the app being under the main bar on newer Android versions.

app/src/main/res/layout/activity_main.xml

@@ -7,8 +7,8 @@
     android:paddingLeft="@dimen/activity_horizontal_margin"
     android:paddingRight="@dimen/activity_horizontal_margin"
     android:paddingTop="@dimen/activity_vertical_margin"
-    android:layout_marginTop="?android:actionBarSize"
-    tools:context="com.hyperling.apps.the45minuterule.MainActivity">
+    tools:context="com.hyperling.apps.the45minuterule.MainActivity"
+    android:fitsSystemWindows="true">
 
     <ScrollView
         android:layout_width="match_parent"