Hi Françesco,
You need to alter this portion of your css :-

/*The container - edit "230" to your desired width for the sidebar (lines 55, 58, 62)*/
#container{
	width: 100%;
	float: left;
	margin-right: -230px;
}
#content{
	margin-right: 230px;
	padding: 25px 0;
}
#sidebar{
	width: 230px;
	float: right;
	padding: 25px 0;
	text-align: left;
}

If you change all the 230px to whatever you want then the body will expand to take up the extra room.

¥

uhm, it doesn't work -- only mess up my sidebar.
What I'm looking for is to expand before the rest the WHITE background; only after I could expand those fields (sidebar, content and container).
How to?

Thanks ruleR :D

Hi Françesco,

If you look just above that section of css you'll see that the wrapper is set to 700px, you can change that to a higher number, but you'll see some funky things happen to your skin if you do ;)

¥

I tried to, but nothing happens (even if I set something like 1100!)...is it "locked" by other tags?

Changing this bit of code makes the content wider (but as I said, you'll see some funky stuff happening) :-

#wrapper{
	width: 800px;
	margin: auto;
	background: white url(img/01_bodybg.jpg) repeat-y;
	text-align: left;
}

¥