#main-content {
    width: 960px;
    background: orange;
    height: auto; padding-top: 10px; margin-left: 170px; 
}

#header {
    background-color: black;
    height: 100px;
}

#video-player-content {
    background-color: green;
}

#video-player {
    background-color: yellow;

}

#control-panel {
    background-color: lightblue;
}