body {
    padding: 0;
    margin: 0;
}

header {
    position: absolute;
    top: 0;
    width: 100%;
    padding: 0;
    height: 80px;
    background-color: black;
}
#content {
    position: absolute;
    padding: 0;
    bottom: 0;
    top: 80px;    
    border-top: 4px solid black;
    width: 100%;
    background-color: white;
    overflow: hidden;
}
#content_frame {
    width: 100%;
    height: 100%;
    border: 0;
    padding: 0;
    margin: 0;
}