habitica-android/Habitica/res/drawable/support_info_lower_bg.xml

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

    <!-- view background color -->
    <solid
        android:color="@color/brand_400" >
    </solid>

    <!-- Here is the corner radius -->
    <corners android:radius="8dp">
    </corners>

</shape>