HTML {
	overflow: hidden;
}
body {
	background-color: #ffffff;
}
#conteneur {
	height: 600px;
	width: 800px;
	left: 50%;
	top: 50%;
	margin-left: -400px;
	position: absolute;
	margin-top: -300px;
}
#fermer {
	margin: 0px;
	padding: 0px;
	position: absolute;
	right: 10px;
	bottom: 10px;
}