session-android/app/src/main/res/drawable/prominent_outline_button_medium_background.xml

<?xml version="1.0" encoding="utf-8"?>
<ripple xmlns:android="http://schemas.android.com/apk/res/android"
    android:color="?prominentButtonColor">
    <item>
        <shape android:shape="rectangle">
            <solid android:color="?colorPrimary"/>
            <corners android:radius="@dimen/medium_button_corner_radius" />
            <stroke
                android:color="?prominentButtonColor"
                android:width="@dimen/border_thickness" />
        </shape>
    </item>
</ripple>