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">
    <solid android:color="@android:color/transparent" />
    <padding android:bottom="@dimen/conversation_activity_compose_padding"
             android:left="@dimen/conversation_activity_compose_padding"
             android:right="@dimen/conversation_activity_compose_padding"
             android:top="@dimen/conversation_activity_compose_padding" />
</shape>