786,432 pixels.
And 34.48 KB, if you were wondering.
Edit: My mistake, that was for only one tile of the background image, so who knows how many freaking times that was repeated. Tried looking at the source code, but to me, it might as well have been written in German by a dyslexic lemur.
Edit: Oh look, the site gives you the answer. Hoopy.
Edit: By the way, I am stupid.