NewPipe-app-android/app/src/main/res/layout/player_popup_close_overlay.xml

<?xml version="1.0" encoding="utf-8"?>
<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    android:layout_width="match_parent"
    android:layout_height="match_parent">

    <com.google.android.material.floatingactionbutton.FloatingActionButton
        android:id="@+id/closeButton"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_gravity="bottom|center_horizontal"
        android:layout_marginBottom="24dp"
        android:src="@drawable/ic_close"
        app:backgroundTint="@color/light_youtube_primary_color"
        app:borderWidth="0dp"
        app:fabSize="normal" />
</FrameLayout>