Radiokot

<layer-list xmlns:android="http://schemas.android.com/apk/res/android">
    <item
        android:id="@android:id/background"
        android:bottom="1dp"
        android:left="1dp"
        android:right="1dp"
        android:top="1dp">
        <!-- 1 dp padding makes the background thinner -->
        <shape>
            <corners android:radius="1dp" />