libpdfviewer/app/src/main/res/values-night/styles.xml

<resources>

    <!-- Base application theme. -->
    <style name="AppTheme" parent="Theme.Material3.DayNight.NoActionBar">
        <!-- Customize your theme here. -->
        <item name="colorPrimary">#DEFFFFFF</item>
        <item name="android:statusBarColor">#212121</item>
        <item name="android:navigationBarColor">@android:color/transparent</item>
    </style>

    <style name="AppTheme.PopupOverlay" parent="ThemeOverlay.Material3.Dark" />

</resources>