Just too cool - - just getting started? Start learning CSS3 by watching your styles applied as you edit. There's a page full of great CSS3 example code you can edit. In addition to learning, this site generates the style rules for cross browser support.
IMPORTANT: When you edit CSS in left column, be sure to click on: [toggle rule on] to see the results within box located in right column.
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CSS has become the standard for building websites in today's industry. Whether you are a hardcore developer or designer, you should be familiar with it. This article is an oldie, but goodie. If you're new to real CSS styling, this is a great place to start.