And to vote on mobile I have to zoom in because the buttons are way to close to each other and give no feedback which of the two was pressed (and no way to find out after the fact).
One tip, when you up vote or down vote a link is added to the comments header. It will either be “unvote” or “undown” depending on whether you up or downvoted the comment.
Except on mobile. The UI elements are tiny, try closing ten comments without clicking the timestamp by mistake at least once.