[Theme: ChocoTheme] Background image does not fit screen

Hello!

I formerly used the same theme on a WordPress.com blog. There, the background picture filled the whole screen, even on a wide screen monitor. It seemed to be fixed on the left hand side, but covered the whole background.

However, on WordPress.org the picture is centered around the page box, which seems to be more narrow than on WordPress.com. On the left and on the right sides you can see the brown background 🙁 Using a larger picture does not help.

I also noticed that the theme does not accept pictures of a very large size. It just does not upload them, but without any error message. This is counter-intuitive.

http://wordpress.org/extend/themes/chocotheme/