Adding a border to the webpage

I added this to the overide.css to give a border to my site.

#mainContent {
margin-top: -2px;
background: #fff url('../images/mainbody_bg.png') repeat-x left top;
overflow: hidden;
border-left:#000 2px solid;
border-right:#000 2px solid;
}

My URL: http://www.texasattorneyassist.com/

There is no header graphic, I am using 1 background image and as you can see I have added an overlap for the menu to the left and right- the border is extending up > see right side of menu. Did I put the border correctly and is their anything I can just so the border extends up to the bottom of the main nav menu.

I hope I am making sense..
Trey

I am not going to use the border on my site; but, if not too much trouble can you tell me if I did this correctly please.

Trey

Well code is ok although it doesn't look nice with your menu ; )

See you around...