anniavee on "Borders do not extend when scrolling down"

I'm trying to figure out how to get the vertical borders flanking the main column to span the entire length of the page when scrolling down. On the Contact page,
the borders get cut off above the footer bar. Is there a way to resolve this so that they extend? Below is the code I've used to insert the borders:

body.no-sidebar {
margin-left:300px;
border-left:6px solid #d8d8d8;
margin-right:300px;
border-right:6px solid#d8d8d8;
}