> It should also be slightly wider (if possible) (right now it's 134 pixels, so maybe it should be 138px)

yeah, currently ratio bar fitted between like \ dislike buttons + counters, so there is always some changes in width. Give possibility to fix width via options its also good alternative.

https://github.com/NC22/KellyC-Return-YouTube-Dislikes/blob/main/extension/lib/kellyShowRate.js#L141

I'll check other margins too