Macbook Air, I've revisited the page since making that comment and tried turning AdBlock back off. It seems to be a problem with just a couple of adverts I was

Macbook Air, I've revisited the page since making that comment and tried turning AdBlock back off. It seems to be a problem with just a couple of adverts I was unfortunate to come across - they took up the bulk of the screen from the bottom, were fixed position, and they didn't have 'close' options. One was a public health campaign, don't remember the other one. Most of the adverts don't have this problem because no matter how large they are, they have some kind of close button. I won't uninstall AdBlock, because I could quite easily imagine coming across the same sort of ad in future, but I'm keeping it paused at least for now.