New source found from dndbeyond.com

ddb_main/tools/js/CharacterSheet/containers/Notes/Notes.tsx

@@ -1,4 +1,3 @@
-import { visuallyHidden } from "@mui/utils";
 import React from "react";
 import { connect } from "react-redux";
 
@@ -10,6 +9,7 @@ import {
 
 import { TabFilter } from "~/components/TabFilter";
 import { PaneInfo, useSidebar } from "~/contexts/Sidebar/Sidebar";
+import a11yStyles from "~/styles/accessibility.module.css";
 import { PaneComponentEnum } from "~/subApps/sheet/components/Sidebar/types";
 
 import { appEnvSelectors } from "../../../Shared/selectors";
@@ -71,7 +71,7 @@ class Notes extends React.PureComponent<NotesProps> {
   render() {
     return (
       <section className="ct-notes">
-        <h2 style={visuallyHidden}>Notes</h2>
+        <h2 className={a11yStyles.screenreaderOnly}>Notes</h2>
         <TabFilter
           filters={[
             {