div#conteneur{
    position:absolute;
    top:-2px;
    left:50%;
    margin-left:-390px;
    width:780px;
    background-repeat:no-repeat;
    z-index:1;
    }
div#page-html{
    position:absolute;
    top:110px;
    left:50%;
    width:780px;
    margin-left:-390px;
}