NewPipe-app-android/app/src/main/res/values-v27/styles.xml

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

    <style name="Base.V27.DarkTheme" parent="Base.V7.DarkTheme">
        <item name="android:navigationBarColor">@color/dark_background_color</item>
        <item name="android:windowLightNavigationBar">false</item>
    </style>
    <style name="Base.DarkTheme" parent="Base.V27.DarkTheme" />

    <style name="Base.V27.BlackTheme" parent="Base.V7.BlackTheme">
        <item name="android:navigationBarColor">@android:color/black</item>
    </style>
    <style name="Base.BlackTheme" parent="Base.V27.BlackTheme" />
</resources>