/*entete*/
body
{
margin-bottom: 20px;
background-color: white;
margin: auto;
}
#design
{
width:800px; 
 position:absolute;
 left: 50%;
 margin-left: -390px;

}

#en_tete
{
   position : absolute;
   left: 207px; 
   top: 5px;
   margin-left: 20px;
margin-bottom: 0px;
}