This week's book giveaway is in the OCMJEA forum. We're giving away four copies of OCM Java EE 6 Enterprise Architect Exam Guide and have Paul Allen & Joseph Bambara on-line! See this thread for details.
All the colors and styles are defined in CSS files; either somehow you've found yourself behind a firewall that's blocking CSS, or perhaps the cache on your machine (or a proxy or firewall you're going through) contains a bad version of our CSS file. I'd start by completely clearing your browser cache.