I'm not totally unfamiliar with CSS at a high level, but I'm far from functional in a usable sense. E.g., I can poke around and alter some existing settings but nothing really beyond that. So, this might be on the right track but be the wrong attribute, etc.
At any rate, the 'flashing' highlights as I hover around are distracting and I'd love to turn them off.
I also found the highlights on hover too annoying, so recently I've tried to find a solution for it. For the Rich Text Editor, you need something like this:
It still has a slight change when I hover over it, but it’s much better. I use a dark theme, so the document background is (almost?) black. If a table row has a colored background, the background will now change to black when hovered, but that’s much less distracting than changing to a light shade as before.
Is there a value other than !important that would simply restore the default background?