Department of Defense
Do Dea: Web Design: Module 6: Web Authoring / Intro to Css
In Module 6 of this course on web design, students learn how web designers use Cascading Style Sheets, i.e., CSS, for formatting elements of web pages to make them visually appealing and consistent across a web site.
Other
Elated Communications: Css Tutorials
This tutorial shows you how to create Cascading Style Sheets, the powerful supplement to HTML that allows you complete control over the look of your websites. Find out some of the cool tricks you can achieve with them.
Wikimedia
Wikipedia: Cascading Style Sheets (Css)
A Wikipedia description of Cascading Style Sheets (CSS) which are used in web development.