User card overlay bugs over comments

It looks like z-index is a little bit skewed. This happens, when I hover over the name of a user at the end of a post, the overlay opens up positioned over the comments (e.g. there is more distance between mouse cursor and bottom browser edge than between mouse cursor and top browser edge), and there are comments.

A quick fix would be to add z-index: 1; or so to .post-page .post-page__main.