Now narrower, and with a stylesheet

tag(s): #meta A while ago I mentioned that I was meaning to move the CSS on the site to a single stylesheet. All the pages had the exact same style anyway, so it's not like it made a difference to have it inlined or use a common file. That wasn't the case initially, when for example pages without img tags didn't have styling for them. But at some point I felt like saving those few bytes wasn't…