chromium/components/browser_ui/modaldialog/android/java/res/values-large/themes.xml

<?xml version="1.0" encoding="utf-8"?>
<!--
Copyright 2021 The Chromium Authors
Use of this source code is governed by a BSD-style license that can be
found in the LICENSE file.
-->

<resources xmlns:tools="http://schemas.android.com/tools">
    <style name="ThemeOverlay.BrowserUI.Fullscreen.DialogWhenLarge" parent="ThemeOverlay.Material3.Dialog">
        <item name="android:backgroundDimAmount">0.65</item>
    </style>
</resources>