Anyone know of a good free website hosting site that allows .css files?

Google and Bing have failed me. I’m trying to find a free website hosting site where I can save a .css page to put my css coding for the whole site into, rather than having to update each page every time I change something. Hoping one of you Jellies happens to know of one?

Or maybe some clever way that I don’t know about to make a .htm(l) webpage act like a .css one?

My “site” is really just for fun and for passing time, nothing serious at all, so I don’t want to pay for anything… but since it is just for fun, and copy-paste-repeat isn’t so much fun, looking for something easier

Thanks in advance!