What would I change on UX
I was asked to spill out what would be my UX changes, so here I go. My personal opinion on UX is in majority about my own discomfort with white background. As person working on computer for 10-12 hours per day, every time I open website with white background I get "blasted" with brightness and it makes my eyes tired faster. Please take a note this is all just my personal opinion which does not represent what might be preferred UX by majority.
It is generally better for human eyes to work with dark colors not just for performance but for medical reason as well. There are 3rd party programs which compensate brightness (warmth and cooling) based on your preferred settings, but I still prefer if it is "built-in" perhaps as a themes or hard coded.
More distinct borders of cells and frames might help faster orientation on website. Right now I feel like I am staring on a wall full of information which I need to "manually" filter out by focusing on those sneaky light grey borders (or perhaps they are just lost in the bright white background - at the end it is matter of contrast). Eg. I need to spend extra time on focusing what is Menu, Headline, Information, Button etc.
Shortcuts for basic formatting like Bold - CTRL+B.
That is all what is "bothering" me. It is not deal breaker at all, just something I would found more convenient