#header
{
top:0; left:0; right:0;
position:fixed;
background-color:#ffffff;
width:100%;
height:100px;
z-index:9999;
/*border-bottom:1px solid black;*/
}

#contenu
{
top:150px; left:0; right:0;
position:absolute;
width:100%;
z-index:999;
/*border-bottom:1px solid black;*/
}

#blue
{
top:900px; left:0; right:0;
position:absolute;
width:100%;
background-color:#a13dac;
z-index:999;
/*border-bottom:1px solid black;*/
}

#white
{
top:1200px; left:0; right:0;
position:absolute;
width:100%;
z-index:999;
/*border-bottom:1px solid black;*/
}