Why is my CSS code not displaying properly on Firefox?

[pattersonz]

I'm learning CSS using the book called "Beginning CSS Web Development: From Novice to Professional" by Simon Collison of web design company, distributed by Apress.

I'm just in the first three chapters and I already have a display issue. The book's description shows up properly in IE but not in Firefox. There are nothing fancy yet, since it's still early in the book, but I feel I can't proceed unless I figure out what I did wrong three chapters into the book.

I downloaded most of the base templates from the apress website, and just followed along with the book. The result is here:

http://home.ca.rr.com/trashcanltd/csscla...