How do I add 1px border to a div whose width is a percentage?

Question

I have this jsfiddle http://jsfiddle.net/tara_irvine/DZLTJ/1/ which explains my problem.

I want the menu items along the top to be 20% of the window but I also want

Answer 1

For this you can use css box-sizing for this:

like this:

#nav_1232938 li, .row {
    -webkit-box-sizing: border-box;
       -moz-box-sizing: border-box;
            box-sizing: border-box;
}