Content Background Options and Website Size Question

So I just spent the last hour customizing my Chess.com theme when something occurred to me...

Why can't we make our Content Background (this font box is inside of it) transparent? This would be a great little feature and could improve the look of a person's personal theme by quite a bit.

Also, if possible, what is the Width and Length of Chess.com? I wouldn't mind finding a background or making one that fits the exact size of the website so I don't have to tile everything.

To make your content background transparent, click inside the color choice box and type in 'inherit' (without quotes).

As for width and length of Chess.com, it depends on the display a person is using. 

Aha, so it is dependent. With how high my resolution is, that would explain why it is so difficult to find a proper sized background.

Thanks ^^