Change header content style of RingtoneActivity subclasses

app/src/main/AndroidManifest.xml

@@ -11,7 +11,7 @@
         android:icon="@mipmap/ic_launcher"
         android:label="@string/app_name"
         android:supportsRtl="true"
-        android:theme="@style/AppTheme.Dark">
+        android:theme="@style/AppTheme">
         <activity
             android:name=".MainActivity"
             android:label="@string/app_name"

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

@@ -3,5 +3,6 @@
            xmlns:app="http://schemas.android.com/apk/res-auto"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
-           style="@style/TextAppearance.AppCompat.Display2"
+           style="@style/TextAppearance.AppCompat"
+           android:textSize="@dimen/text_size_display_2"
            android:theme="@style/AppTheme.TextOverlay"/>

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

@@ -3,5 +3,6 @@
     xmlns:android="http://schemas.android.com/apk/res/android"
     android:layout_width="wrap_content"
     android:layout_height="wrap_content"
-    style="@style/TextAppearance.AppCompat.Display2"
-    android:textColor="?android:attr/textColorPrimaryInverse"/>
+    style="@style/TextAppearance.AppCompat"
+    android:textSize="@dimen/text_size_display_2"
+    android:theme="@style/AppTheme.TextOverlay"/>