See the screenshot below. I see two display issues:

1. The highlight dot is not centered vertically within the little button that calls the color selector (the margin appears to be about 1px below but 3 px above the dot).
2. Inside the Highlight color menu, the check mark is not centered vertically within the highlight dot.

I see both issues in Mac Chrome and Mac Safari, though #1 looks worse in Chrome.For reference, here is a screenshot in the Help docs that shows how these used to look.