Thanks for the insult. "Very motivating to file anything here".
I did some deeper investigation. You are right. See the picture. The top is from Debian 10 Buster, the bottom from 9 Stretch. (Sorry no picture, got "Something went really wrong, and we can’t process that file Try again". <rant>Why not some information on what went wrong, in stead of letting me trial en error which I am not willing to do? Hmm, I did and solved it, so there is a picture :-)</rant> )
They changed the themes :-( I could not find an alternative theme which looked like it was, I liked. <rant> Why can't things that are good not be left alone?</rant> <rant>Why has text to be made less readable by making it gray on an often a bit lighter gray background? Often it is not about looking nice but about usability.</rant> <rant>Often new features are in favor of a better intuitive use</rant>
I tried to make my own theme some time ago. It was not easy. Do you have any tips how to do it? 