Forum CSS question
 

I've created a notice using html which I want to appear at the top of the entire forum (where notices normally appear). Now the HTML that I'm using needs it's own custom CSS which I have added to CSS Templates >> additional css. The notice shows up only in the CMS section of the forum fine; in the rest of the forum and blogs it's "styleless" :)

Is there another template I need to edit? If so, which one?