Cascading Style Sheets (CSS) is a powerful tool that transforms the presentation of a document or a collection of documents, and it’s spread to nearly every corner of the Web—as well as many non-web environments. In this free introduction to Cascade Style Sheets, you’ll learn how CSS makes it possible for you to completely change the way document elements are presented by a user agent. You’ll discover the origins of this specification and how CSS styles work with HTML.
Learn how you can choose style sheets based on the features of a given media type, including desktop screens, web-enabled phones, digital projectors, TVs, Braille devices, print documents, and even various audio renderings of a document. CSS and Documents is an excerpt from the forthcoming 4th edition of CSS: The Definitive Guide.
Great info for css that helped me clear up some questions on page structure.