New source found from dndbeyond.com

ddb_main/tools/js/CharacterSheet/containers/mobile/DescriptionMobile/DescriptionMobile.tsx

@@ -1,7 +1,7 @@
-import { visuallyHidden } from "@mui/utils";
 import { FC } from "react";
 
 import { useCharacterEngine } from "~/hooks/useCharacterEngine";
+import a11yStyles from "~/styles/accessibility.module.css";
 
 import MobileDivider from "../../../components/MobileDivider";
 import SubsectionMobile from "../../../components/SubsectionMobile";
@@ -13,7 +13,7 @@ export const DescriptionMobile: FC = () => {
     <SubsectionMobile className="ct-description-mobile">
       <MobileDivider label={"Background"} theme={characterTheme} />
       <section>
-        <h2 style={visuallyHidden}>Background</h2>
+        <h2 className={a11yStyles.screenreaderOnly}>Background</h2>
         <Description theme={characterTheme} isVertical={true} />
       </section>
       <MobileDivider isEnd={true} theme={characterTheme} />