HTML/CSS Tutorial

I did the Large Background tutorial found at http://www.webdesignerwall.com/. I liked the way that the pictures filled up the whole screen like the desktop of your computer. I found it dramatic and different. The technique was easy to use. The hardest part was finding an image that wasn't too "busy". I don't see any ways to modify the technique - it is so simple and straightforward. The tutorial was easy to follow, so yes I would recommend it.

A question that I do have. The CSS contains "display: table". The tutorial said that this was used so that the page displayed correctly in firefox. But it didn't explain how it worked. So that is my question. How and why does this line work?

The web page that I created can be found at http://perceval.gannon.edu/nixon005/C17/Nixon2.html.