I just centered mine (http://spiceandwolf.99webs.info/characters.html) with

#wrapper { width: 900px;
margin: 0 auto;
}
then everything in the <div id="wrapper"> is centered </div> try that. make the px match your area though. and sorry if i caused any confusion i was just messing before.

Also my book says this should be the first thing in your document <?xml version="1.0" encoding="UTF-8"?> however the page never loads with that in there. i take it out and it works fine.

I tried adding that (adjusted the px), and it didn't work. I might just try to find some one willing to create a theme for me...