.conteneur {
	position:absolute;
	left: 50%; 
	top: 50%;
	width: 1000px;
	height: 580px;
	margin-top: -290px;
	margin-left: -500px;
	z-index:2;
}
.background {
	position:absolute;
	left: 50%; 
	top: 50%;
	width: 1418px;
	height: 65px;
	margin-top: -170px;
	margin-left: -709px;
	background-image: url(images/corde_pince_index.jpg);
	background-repeat: no-repeat;
	z-index:1;
}