Absolutely positioned element vs flexbox conflict in Firefox? How to fix?

Question

css

I noticed that in Firefox, the card button flies to the side when hovering. How to fix it, what was exactly in the center? By pixel does not roll, tk. there must be a universal solution. anxious-sponge.surge.sh

Answer 1

It's funny, but on my mac in ff everything is ok, but in safari:
https://www.dropbox.com/s/3jf7c9go6dfhwjf/%D0%A1%D...
ff ver. 54.0.1
safari ver. 10.1.1 (12603.2.4)