/nukeleo/styles/styles.css
The background supplied is not sufficient for higher resolution displays. I would suggest doing like I have and replacing the background with a wider one, then using a format like this
Code:
background:#010408 url(../misc/bg3.jpg) fixed repeat-x;
Here I have added a color to take up the blank space the bottom of my background image wouldn't fill in, make sure it is a color that will blend in.
Also the transparent background when adding shoutbox and other mods is not going to work to well, if you really want it to look good you will have to recode every mod that needs to use the theme
I've done the chatbox so far..