app/src/main/res/drawable/background_participant_in_call_element.xml
<?xml version="1.0" encoding="utf-8"?>
<shape xmlns:android="http://schemas.android.com/apk/res/android">
<solid android:color="?attr/colorSecondary" />
<padding
android:left="10dp"
android:right="10dp"
android:bottom="5dp"
android:top="5dp" />
<corners
android:radius="20dp" />
</shape>