I am creating custom styles for a client. While I could train her on how to apply those styles by adding code in the Text view, it would be easier if I could just create a dropdown of the styles she needs for the visual mode. I’ve done several searches for a discussion on this topic, but I’m probably using the wrong terminology, so the searches are empty.

I see some plugins that seem to do that task, but they aren’t up-to-date with the current WordPress version.