I wanted to make a strong recommendation you pick up Cascading Style Sheets: Separating Content from Presentation, Second Edition, Second Edition. I read the first half of the book a couple of weekends ago and was so inspired, I tore into one of my websites for a major overhaul. The book lays out the issues of CSS, the tricks to implementations, and the details of how rules and selectors and cascading and “inheritance” (I have to quote it – CSS inheritance is much more containership than OOP’s version of inheritance, a poor choice of terms, imo). The writing is fast-paced, easily-comprehensible and entertaining. Best CSS book I’ve read to date.