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

<?xml version="1.0" encoding="utf-8"?>
<!-- bordered sides for tablet UI -->
<layer-list xmlns:android="http://schemas.android.com/apk/res/android">
    <item>
        <shape android:shape="rectangle">
            <solid android:color="@color/grey_lighten_20" />
        </shape>
    </item>
    <item android:left="1dp" android:right="1dp">
        <shape android:shape="rectangle">
            <solid android:color="@color/white" />
        </shape>
    </item>
</layer-list>