ring-android/app/src/main/res/drawable/textmsg_background.xml

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

    <stroke
        android:width="0dp"
        android:color="@android:color/transparent" />

    <solid android:color="@color/grey_200" />

    <padding
        android:left="1dp"
        android:right="1dp"
        android:top="1dp" />

    <corners android:radius="16dp" />

</shape>