When hovering over the number of annotations for a user, the (white) text becomes blue and hard to read. If you've already clicked that link, the problem is permanent:
It's better to keep it white, just like the number of flags received:
The gray indicator for Community Team messages has the same problem:
.supernovabg
style doesn't have a foreground color defined. The real root cause is that Stacks is a regression from 25 years ago in terms of web design, and the only way to "fix" it is to add!important
hacks on top of hacks.