html, body{
    margin:0;
    padding:0;
}
#container{
    position:relative;
    width:100%;
    overflow: hidden;
}
#top{
    position:absolute;
    top:0;
    left:0;
    right:0;
    z-index:2;
}
#bottom{
    position:absolute;
    bottom:0;
    left:0;
    right:0;
    z-index:2;
}