NewPipe/app/src/main/res/values-v21/styles.xml

<resources>
    <!-- Base application theme. -->
    <style name="AppTheme" parent="Theme.AppCompat.Light">
        <item name="android:actionBarStyle">@style/NewPipeActionbarTheme</item>
        <item name="actionBarStyle">@style/NewPipeActionbarTheme</item>
        <item name="android:colorPrimary">@color/primaryColorYoutube</item>
        <item name="android:colorPrimaryDark">@color/primaryColorDarkYoutube</item>
        <item name="colorAccent">@color/accentColorYoutube</item>
        <item name="android:colorAccent">@color/accentColorYoutube</item>
    </style>

    <style name="NewPipeActionbarTheme" parent="Widget.AppCompat.Light.ActionBar.Solid" >
        <item name="android:displayOptions">showHome</item>
        <item name="displayOptions">showHome</item>
        <item name="android:background">@color/primaryColorYoutube</item>
        <item name="background">@color/primaryColorYoutube</item>
    </style>

    <style name="VideoPlayerTheme" parent="Theme.AppCompat.Light.DarkActionBar">
        <item name="android:windowFullscreen">false</item>
        <item name="android:windowActionBarOverlay">true</item>
        <item name="windowActionBarOverlay">true</item>
        <item name="android:actionBarStyle">@style/VideoPlayerActionBarTheme</item>
        <item name="actionBarStyle">@style/VideoPlayerActionBarTheme</item>
        <item name="colorAccent">@color/primaryColorYoutube</item>
        <item name="android:colorAccent">@color/primaryColorYoutube</item>
        <item name="android:windowBackground">@android:color/black</item>
    </style>

    <style name="VideoPlayerActionBarTheme" parent="Widget.AppCompat.Light.ActionBar.Solid.Inverse" >
        <item name="android:displayOptions">showHome</item>
        <item name="displayOptions">showHome</item>
        <item name="android:background">@color/black_overlay</item>
        <item name="background">@color/black_overlay</item>
    </style>
</resources>