Xtreme web page html background

[lklein]

I am new to xtreme.

I can't find a template I like so am trying to make a website from scratch with extreme 5.

Let's say my website is 900px. In a large moniter their will be the outer background.

In Dreamweaver I can change this color with CSS by using either the html or body tag.

I'm trying to figure out how to do this with xtreme 5. I can't find a way.

Is there a way or will I have to export and edit with Dreamweaver when I'm finished?

Thanks
Lambert