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

<?xml version="1.0" encoding="UTF-8"?>
<inset xmlns:android="http://schemas.android.com/apk/res/android">
    <shape android:shape="rectangle">

        <solid android:color="@color/grey_lighten_30" />

    </shape>
</inset>