Single post in Upcoming Nav-Bar Changes (Preliminary)

This is great, I was getting used to all the navigation buttons, and rather really like it now. Is CSS allowed on the site? I do realize that's for like the backgrounds of webpages...I know nothing about CSS, but was wondering if there was a way to make it like the OP's screenshot...all black, instead of this green coloring to the pages, not that I dont like it, I dont mind, but I much prefer the darker colors myself---and if so, if there were any folks doing things like that for in-game stuff, or forum posts to learn. I think, I shall however, tinker with the bookmarks, that looks really really helpful! Thank you!