Nope, back again! So I'm messing around in the style sheet, but I'm not sure why the background image isn't loading in- do I need to make a specific folder for it to be loaded from?
Yes, if you're working in Tweego, you'll need a folder in your Export folder labeled "images". As for Twine in the browser, you'll need to export your entire project to view changes to any images. I'm not sure where those images are supposed to go (I had previously hosted them somewhere and used their URL in the :root), but I'm not certain that works anymore.