Make DIV cover 100% of viewport instead of 100% of Body

Question

My post is in regards to http://www.thepostboard.net

I need to make the black box that is currently covering 100% of the viewport cover the entire page instead. You\'ll

Answer 1

This solution has worked best for me:

#overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
}

No need to style any other elements except the tag.