The only problem I'm encountering is every time I change an extension, I have to reupload my current forum.css file. It's like it's caching to old content on the extension update, I've done everything I can think of to "update it" but oh well.
Stealth changes for css need to be made inside the admin panel under "Appearance" - "Custom styles" so that they are incorporated when any change to your forum happens (extension enable or disable and cache flushes).
Welcome to Flarum 🙂
little suggestion, your background is repeated, u might want to fix that 😉