body
{
text-align: center;
width:  90%;
height: 90%
margin: 5%;
background-image : url(fan.jpg); 
background-repeat : no-repeat; 
background-attachment: fixed; 
background-position: 1px 10px ;
}

#entete
{
width: 50%;
text-align: center;
margin-left: 30%;
margin-right: 30%;
}

#corps
{
padding : 2px;
width: 50%;
height: 50%;
margin-top: 5%;
margin-left: 30%;
margin-right:30%;
background-color: #808080;
border : 3px double #c0c0c0;
}

a
{
text-decoration:none;  
}

#back
{
width: 50%;
margin-top: 5%;
margin-left: 30%;
margin-right: 30%; 
height: 10%;
text-align: center;
}