use darker fallback color

src/main/res/values/styles.xml

@@ -36,8 +36,8 @@
 	</style>
 
 	<style name="FallbackThemingTheme" parent="Theme.AppCompat.Light.DarkActionBar">
-		<item name="colorPrimary">#616161</item>
-		<item name="colorPrimaryDark">#424242</item>
+		<item name="colorPrimary">#424242</item>
+		<item name="colorPrimaryDark">#212121</item>
 		<item name="colorAccent">#757575</item>
 	</style>