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

<?xml version="1.0" encoding="utf-8"?>
<resources>

    <!-- Opening Theme -->
    <style name="Base.V21.OpeningTheme" parent="Base.V19.OpeningTheme">
        <item name="android:navigationBarColor">@color/light_youtube_primary_color</item>
    </style>
    <style name="Base.OpeningTheme" parent="Base.V21.OpeningTheme" />

    <!-- Base Theme -->
    <style name="Base.V21" parent="Base.V19"/>
    <style name="Base" parent="Base.V21"/>

    <!-- Light Theme -->
    <style name="Base.V21.LightTheme" parent="Base.V19.LightTheme">

    </style>
    <style name="Base.LightTheme" parent="Base.V21.LightTheme" />

    <!-- Dark Theme -->
    <style name="Base.V21.DarkTheme" parent="Base.V19.DarkTheme">

    </style>
    <style name="Base.DarkTheme" parent="Base.V21.DarkTheme" />

    <!-- Black Theme -->
    <style name="Base.V21.BlackTheme" parent="Base.V19.BlackTheme">

    </style>
    <style name="Base.BlackTheme" parent="Base.V21.BlackTheme" />

</resources>