teapod/app/src/main/res/drawable/bg_circle__black_transparent_24dp.xml

<?xml version="1.0" encoding="utf-8"?>
<shape xmlns:android="http://schemas.android.com/apk/res/android"
    android:shape="oval">
    <size android:width="24dp"
        android:height="24dp"/>
    <solid android:color="#81000000"/>
</shape>