I mostly read this forum on an iPad. The banner is full width, and the other bits are about 3/4th of the total width. In landscape mode that isn't a problem as the text is still very readable. In portrait mode the non-banner bits are too small, but this doesn't matter much as I read allmost all websites in landscape mode.

I wouldn't mind having a black text on whitish background too, but the real bugbear is black text on a dark blue background, like in some of the buttons. Fortunately there are not many of those. Blue text on a black background is OK.