RetroMusicPlayer/app/src/main/res/drawable/shadow_down.xml

<?xml version="1.0" encoding="utf-8"?>
<shape xmlns:android="http://schemas.android.com/apk/res/android"
    android:shape="rectangle">
    <gradient
        android:angle="90"
        android:centerColor="#11000000"
        android:endColor="@color/twenty_percent_black_overlay"
        android:startColor="#00000000" />
</shape>