The Web Design Group was founded to promote the creation of non-browser specific, non-resolution specific, creative and informative sites that are accessible to all users worldwide http://www.htmlhelp.com/reference/css/quick-tutorial.html
This is a short guide to styling your Web pages. It will show you how to use W3C's Cascading Style Sheets language (CSS) as well as alternatives using HTML itself. http://www.w3.org/MarkUp/Guide/Style.html
If you're tired of css crashing the browser, like an invalid page fault in netscape 4.x, or if you're advanced css is causing problems in older web browsers, then take a look at how you can hide your style sheet from old browsers http://www.dcjt.demon.co.uk/dc/web/2002/hidecss.html