content borders

I have thought that should be right myself many times. If I select the contentwrapper div from within a page and in DW seek to modify it it'll add the following code:
html, body, div, span, applet, object, iframe, h1, h2, h3, h4, h5, h6 {
margin: 0;
padding: 0;
outline: 0;
font-size: 100%;
border-top-width: 1;
border-right-width: 1;
border-bottom-width: 1;
border-left-width: 1;
border-top-color: #FF0000;
border-right-color: #FF0000;
border-bottom-color: #FF0000;
border-left-color: #FF0000;
}

and this adds no border to anything btw.

In the css file there really is no contentwrapper div. There's #outerWrapper #contentWrapper #leftColumn1

and #outerWrapper #contentWrapper #content

so... while writing this I figured it out. I added the following code to the css file and it solved it
#outerWrapper #contentWrapper {
border: 1px ridge #999999;
}

so I guess #contentWrapper's something you could access when first creating the structure, but if you don't, then you'll have to add that code later to the css file?

So I took a peek at the manual for version 2 and there was a section on rounded corners. Is that part of the "adding a new div" feature, that you can add one w/ rounded corner images? Or what's the big deal about adding a new div? The ability to do it from within the structure creator tool (whatever you call it)?