hostage/res/drawable/panel_white_bg.xml

<?xml version="1.0" encoding="utf-8"?>
<layer-list xmlns:android="http://schemas.android.com/apk/res/android">

    <!-- Bottom 3dp Shadow -->
    <item>
        <shape android:shape="rectangle">

            <solid android:color="#FFFFFF" />
            <corners android:radius="4dp" />

        </shape>
    </item>

</layer-list>