@justmicros Thanks so much for that answer, it saved me a lot of time.
One more question, you may know the answer off the top of your head…
I’m trying to work out which display classes are responsible for the back end, in the edit post page. While the custom.css took care of the front end, the back end is now displaying in the old sizing, and so the layout is not consistent – I have to check the front end display and go back and edit layout in the backend.
I can trawl through the css classes, and try and work it out, but it would be a great help if you know off the top your head. I don’t know enough about how the backend it generated, so I don’t even know if it can be changed.