body {
    padding: 0;
    margin: 0;
}

header {
    position: absolute;
    top: 0;
    width: 100%;
    padding: 0;
}
#content {
    position: absolute;
    padding: 0;
    bottom: 0;
    top: 80px;    
    width: 100%;
    background-color: #888;
    overflow: hidden;
}
#content_frame {
    width: 100%;
    height: 100%;
    border: 0;
    padding: 0;
    margin: 0;
}