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

<?xml version="1.0" encoding="utf-8"?>
<layer-list xmlns:android="http://schemas.android.com/apk/res/android">
    <item>
        <shape>
            <padding android:bottom="1dp" />
            <solid android:color="@color/grey_light" />
        </shape>
    </item>

    <item>
        <shape>
            <solid android:color="@color/grey_lighten_30" />
        </shape>
    </item>
</layer-list>