coner_raduis_all_round_background.xml

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

<!-- * the layer list ads styles in layer items-->

<!--    first layer-->
    <item>
        <shape android:shape="rectangle">
            <corners android:topLeftRadius="30dp"
                android:topRightRadius="30dp"
                android:bottomRightRadius="30dp"
                android:bottomLeftRadius="30dp"/>
            <!-- draw a 4 dp width border around the rectangle shape -->
            <stroke android:color="@color/white" android:width="4dp"/>
        </shape>
    </item>

<!--    second layer-->
    <item android:top="4dp" android:left="4dp" android:right="4dp" android:bottom="4dp">
        <shape android:shape="rectangle">
            <corners
                android:topLeftRadius="30dp"
                android:topRightRadius="30dp"
                android:bottomRightRadius="30dp"
                android:bottomLeftRadius="30dp"/>
            <solid android:color="@color/black"/>
        </shape>
    </item>

</layer-list>