#body {
}
#conteneur {
	margin-left: -200px;
	width: 400px;
	left: 50%;
	position: relative;
	float: left;
}
#colonne {
	width: 400px;
	left: 10px;
	top: 10px;
	right: 10px;
	bottom: 10px;
	position: relative;
	float: left;
}