body {
   font-family: Arial;
   background-size: 900px 636px;
   background-repeat: no-repeat;
   background-position: center top;
   border: 0px;
   margin: 0px;
   padding: 0px;
cursor: default;
}

#fond_ecran {
   position: relative;
   width: 900px;
   height: 636px;
   padding: 0px;
   margin-top: 0px;
   margoin-bottom: 0px;
   margin-left: auto;
   margin-right: auto;
   border: 0px;
}