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There are an increasing number of CSS resources around, yet you only have to look at a CSS mailing list to see the same questions popping up time and again. “How do I center a design?” “What is the best rounded-corner box technique?” “How do I create a three-column layout?” If you follow the CSS design community, it is usually a case of remembering which website a particular article or technique is featured on.
However, if you are relatively new to CSS, or don’t have the time to read all the blogs, this information can be hard to track down. Even people who are skilled at CSS run into problems with some of the more obscure aspects of CSS such as the positioning model or specificity.