#conteneur {
	width: 500px;
	left: 50%;
	position: absolute;
	margin-left: -250px;
}
#body {
	background-color: #000000;
	margin: 0px;
}
#conteneur_colonne {
	width: 500px;
	position: relative;
	float: left;
	margin-top: 25px;
}
#colonne_principale {
	width: 500px;
	position: relative;
	float: left;
	background-color: #000000;
	margin-top: 20px;
}
#titre_page {
	width: 500px;
	background-color: #000000;
}