iceraven-browser/app/src/main/res/drawable/top_sites_background.xml

<?xml version="1.0" encoding="utf-8"?>
<!-- This Source Code Form is subject to the terms of the Mozilla Public
   - License, v. 2.0. If a copy of the MPL was not distributed with this
   - file, You can obtain one at http://mozilla.org/MPL/2.0/. -->
<shape
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:shape="rectangle">
    <corners android:radius="4dp" />
    <solid
        android:color="?mozac_widget_favicon_background_color"
        tools:color="@color/photonWhite" />
    <stroke
        android:width="1dp"
        android:color="@color/top_sites_border_color"
        tools:color="@color/photonLightGrey30" />
</shape>