border: 1px solid #663399;
that's just an example.
you can take a look at the site you mentioned css files and get some ideas:
By the way, your site does not seem to work... It forwards to an error page.
Jeah, seems like you have an error in your PHP code.
There is indeed a problem with your website link. At first it would take you to your website but after a few seconds it will redirect to a page with all the errors and scripts. Check on how you installed your forum, it might be the cause of the problem.