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

<?xml version="1.0" encoding="utf-8"?>
<shape xmlns:android="http://schemas.android.com/apk/res/android">
    <gradient
        android:angle="90"
        android:endColor="@android:color/transparent"
        android:centerColor="#80000000"
        android:startColor="@color/md_black_1000" />
</shape>