#conteneur {
background-color: #fffdec;
margin: 0 auto;
}

#entete {
background-color: #ff33cc;
}

#leftside {
background-color: #0000ff;
float: left;
width: 200px;
}

#rightside {
background-color: #ff9900;
float: right;
width: 200px;
}

#middle {
position: relative;
background-color: #339900;
margin-left: 200px;
margin-right: 200px;
}

#footer {
background-color: #fffdec;
font-size: 8px;
clear: both;
}