CSS gives site developers the best of both worlds: content markup that reflects the logical structure of the information and the freedom to specify exactly how each HTML tag will look.
Efficient control over large document sets.
The most powerful implementations of CSS will allow site designers to control the graphic "look and feel" of thousands of pages by
modifying a single master style sheet document.
CSS to the Rescue
Style sheets are not a new concept to the design world. Designers are really looking toward CSS to solve the many problems with layout that tables introduced as well as provide greatter flexibility to a wide range of visual design concerns.