It took me a while to notice the link for this on Flarum's Custom CSS popup. It makes customizing everything wayyyyyyyyy easier (especially as an amateur dev with only a basic grasp of HTML/CSS).
Learning to customize WordPress in the pre-blocks era would've way easier if something like this had existed. I get salty when my questions don't get answers, but really the devs put a lot of thought into helping users they'll never meet.
flarum/frameworkblob/master/less/common/Tooltip.less
Thanks for this devs, rooting for you guys