fedilab-Android-App/app/src/main/res/drawables/mastodon/drawable/bubble_right.xml

<layer-list xmlns:android="http://schemas.android.com/apk/res/android">
    <item android:right="5dp">
        <shape>
            <solid android:color="?attr/colorPrimary" />
            <corners android:radius="8dp" />
        </shape>
    </item>
</layer-list>