This is how we can customize the card's corners

rounded_background_bottom.xml

<?xml version="1.0" encoding="utf-8"?>
<selector android:shape="rectangle"
  xmlns:android="http://schemas.android.com/apk/res/android">
    <item android:state_pressed="true">
        <shape>
            <corners android:topLeftRadius="0.0dip" android:topRightRadius="0.0dip" android:bottomLeftRadius="@dimen/cardview_default_radius" android:bottomRightRadius="@dimen/cardview_default_radius" />
            <solid android:color="@color/pressed_black" />
        </shape>
    </item>
    <item>
        <shape android:shape="rectangle">
            <corners android:topLeftRadius="0.0dip" android:topRightRadius="0.0dip" android:bottomLeftRadius="@dimen/cardview_default_radius" android:bottomRightRadius="@dimen/cardview_default_radius" />
            <solid android:color="@color/rh_white_1" />
        </shape>
    </item>
</selector>