User blog comment:Tama63/The Perfect Theme/@comment-1393830-20110717172043

"Add this css to have a fixed and better quality(larger than 300kb)" This is incorrect, no background can be larger than 300kb. All that CSS does is make the background fixed such that when you scroll, the background moves with you. For comparison Ninja Gaiden Wiki has that CSS in the MediaWiki:Wikia.css. You will notice that The background is always in place no matter how far down you scroll. Bleach Wiki does not have that CSS in place and as such, the background becomes black after a certain point. Both backgrounds are still under 300kb and are not tiled but rather a singular image.