jacobgrillo I'd recommend you learn how to do this yourself, because at some point when you change a CSS rule it will have unintended consequences and you need to know how to change it (including how to select the exact element you want without selecting elements you don't want). You're best off not messing with the CSS at all if you don't understand what you're doing IMO.
I'm thinking about re-publishing my own style as a commercial plugin later. The default style is OK but it has annoyances that I don't care for haha and all my decisions are based on improving the user experience. That's not to have a dig at the Flarum devs at all, we're talking about combining two very distinctly different skillsets when it comes to website or forum design, it probably is best that the default style stays the way it currently is (if you over complicate the default styling you'll just make editing it harder).