chromium/chrome/browser/ui/android/google_bottom_bar/java/res/layout/bottom_bar_button_spotlight_layout.xml

<?xml version="1.0" encoding="utf-8"?>
<!--
Copyright 2024 The Chromium Authors
Use of this source code is governed by a BSD-style license that can be
found in the LICENSE file.
-->

<ImageButton xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="@dimen/google_bottom_bar_button_size"
    android:layout_height="@dimen/google_bottom_bar_button_size"
    android:scaleType="centerInside"
    android:layout_gravity="center_vertical"
    android:importantForAccessibility="yes"
    android:contentDescription="@null"
    android:visibility="visible"
    android:padding="@dimen/google_bottom_bar_button_padding"
    android:clickable="true"
    android:focusable="true"
    android:background="?android:attr/actionBarItemBackground"  />