Ok, first off…
White text on black background, not as bad as some say; not GREAT, but not horrible either. If you were reading an eBook this way, then yes, white on black is probably not a great idea, but for a casino site, it is tolerable.
As far as the code goes…..BLECHHHHH. :Ohno:
You really need to run a validation and get some of it fixed. You have some very MAJOR errors being returned here and some of these cannot be overlooked. I am not here to give an HTML tut, so here is the link to your validation errors, there are plenty of HTML lessons available on W3C, check ’em out:
http://validator.w3.org/check?uri=http%3A%2F%2Fwww.cyberspacegambling.com%2F
I hope some of this helps and assists you to becoming a more profitable affiliate. Enjoy!