#mon_entete  {
	width: 100%;
	height: auto;
}

#cadre_principal_entete  {
	width: 1280px;
	height: 200px;
	margin-left: auto;
	margin-right: auto;
	background-color: red;
}

#contenant_img {
	width: 400px;
	height: auto;
}

#ma_photo {
	width: 100%;
}