LastPipeBender/app/src/main/res/values-v27/styles.xml

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

    <!-- Base Theme -->
    <style name="Base.V27" parent="Base.V21">
        <item name="android:navigationBarColor">@android:color/transparent</item>
    </style>
    <style name="Base" parent="Base.V27"/>

    <!-- Light Theme -->
    <style name="Base.V27.LightTheme" parent="Base.V21.LightTheme">
        <item name="android:windowLightNavigationBar">true</item>
    </style>
    <style name="Base.LightTheme" parent="Base.V27.LightTheme" />

    <!-- Dark Theme -->
    <style name="Base.V27.DarkTheme" parent="Base.V21.DarkTheme">
        <item name="android:windowLightNavigationBar">false</item>
    </style>
    <style name="Base.DarkTheme" parent="Base.V27.DarkTheme" />

    <!-- Black Theme -->
    <style name="Base.V27.BlackTheme" parent="Base.V21.BlackTheme">
        <!-- BlackTheme inherits DarkTheme, so no need to specify windowLightNavigationBar here -->
    </style>
    <style name="Base.BlackTheme" parent="Base.V27.BlackTheme" />

</resources>