Are all your sites designed with amazing CSS? If not, you may want to brush up on your CSS skillz. Check out some of the CSS Cheat sheets that will help you brush up… and remember why CSS is so important:

The content is separated from the design
You site uses less bandwidth and loads faster
Your website will automatically gain better search results
CSS is compatible with newer browsers
CSS can be used to display the same content on different media (Web/Desktop etc.)