The following sites offer additional information and inspiration on the topic of Cascading Style Sheets.

• W3Schools CSS Tutorial — one of the most comprehensive CSS instructional sites on the Web.
• A List Apart — A Web magazine providing regularly updated tutorials on Web development with a strong focus on Web standards, including structural markup and CSS.
• Position Is Everything — convenient source of modern markup instructions and observations regarding browser interpretation of CSS — specifically bugs in Internet Explorer.
• MeyerWeb — Eric Meyer's Web magazine with tutorials, experiments, observations and instructions for CSS.
• CSS Chapters & Articles — excepted chapters from CSS books published by Peachpit Press
• CSS Zen Garden — the inspirational demonstration of separating content from appearance. It includes a single HTML file that can be displayed with hundreds of different style sheets.
• Mezzoblue — Markup-focused Web magazine from the creator of CSS Zen Garden.
• CSS Filters and Hacks — A consolidated reference of various techniques used to filter rules, properties, and even entire files from particular browsers or versions.
• The World Wide Web Consortium (W3C) Cascading Style Sheets Home Page — the source of Web standards, including CSS. Note: the site is not easy to use. The content is more like that of a white paper than of a tutorial. The intended audience appears to be developers of Web browsers rather than Web sites.