session-android/res/drawable/compose_background.xml

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

    <stroke
        android:width="1dp"
        android:color="?attr/conversation_input_outline_color" />

    <solid
        android:color="?attr/conversation_input_background_color" />

    <corners
        android:radius="20dp" />

</shape>