Covers the rules and properties of Cascading Style Sheets, with information on such topics as Web browsers, selectors, the box model, page layouts, typography, lists and tables, media, and resets and frameworks.
The book is nice and it's also small, however, the first and second chapters talk very much about topics (like how W3C handles CSS revisions, rendering modes, etc) that seem nothing for most readers looking for a CSS language reference and not for a W3C standards ref. If you skip the first two chapters, or at least to ignore most of the non-relevant information there, you can get through the book easily.
For the non-relevant chapters and because they're at the beginning of the book (that made me very depressed) I give the book 3/5.