#menu-accueil {
	display: block;
	margin-left: auto;
	margin-right: auto;
}

#tranche-03 {
text-align: center;
}

#tranche-01 {
	background-image: url(../images/tranche_01-accueil.jpg);
	background-repeat: no-repeat;
	text-align: center;
	font-size: 20px;
	font-weight: bold;
}