WordPress/src/main/res/drawable/stats_list_item_expanded_background.xml

<layer-list xmlns:android="http://schemas.android.com/apk/res/android" >

    <item>
        <shape android:shape="rectangle">
            <solid android:color="@color/grey_lighten_30" />
        </shape>
    </item>

    <item android:top="1dp">
        <shape xmlns:android="http://schemas.android.com/apk/res/android" android:shape="rectangle">
            <solid android:color="@color/grey_light" />
        </shape>
    </item>

</layer-list>