Yep, it seems that you added some black space at the top, and that got the job done.
One request - any chance you can increase and/or make a setting for comment text size? It’s much smaller than all the other text and hard to read for my old(er) eyes. I can use the zoom on Safari to increase the page size before saving it as a PWA, but that makes the text run off the right side of the page, requiring me to scroll back and forth to read comments.
I've given it a go on my PC now and have some feedback. Generally, it looks really nice, I enjoy the modern look.
My only real feedback is that it seems too big. The best way I can think to describe it is as follows; it looks like it was made to be touch friendly (which is great!) but then on a monitor it looks too large and uses the full width.
Personally, I'd set a max-width on larger displays to something like 80% (to allow more negative space on the sides, keeping the content centered) and have the cards scale down as well. I'm not sure what you're using for the front-end so I can't be super specific with the correct names of styles etc.
I hope that makes sense. I don't want to take away from the work you've done, it really is well designed! If you need me to explain something better or provide examples (whatever you need), I'd be more than happy to help where possible.