#conteneur {
margin: 5px auto;
width: 100%;
height: 100%;
background-color: transparent;
}

#header {
height: 255px;
width: 591px;
margin-left: 175px;
background-color: transparent;
}

body {
background-image: url(../images/fondBodyViolet.png);
height:100%;
}

#contenu{
text-align:center;
}