html, body{
/*    width:100%; 
    height:100%; 
    padding:0px; 
    margin:0px;
    overflow: hidden;
*/    
    background: #191d1e; /* Old browsers */
    background: -moz-linear-gradient(0deg,  #191d1e 50%, #283139 100%); /* FF3.6+ */
    background: -webkit-gradient(linear, left top, right bottom, color-stop(50%,#191d1e), color-stop(100%,#283139)); /* Chrome,Safari4+ */
    background: -webkit-linear-gradient(0deg,  #191d1e 50%,#283139 100%); /* Chrome10+,Safari5.1+ */
    background: -o-linear-gradient(0deg,  #191d1e 50%,#283139 100%); /* Opera 11.10+ */
    background: -ms-linear-gradient(0deg,  #191d1e 50%,#283139 100%); /* IE10+ */
    background: linear-gradient(0deg,  #191d1e 50%,#283139 100%); /* W3C */
    filter: progid:DXImageTransform.Microsoft.gradient( startColorstr='#191d1e', endColorstr='#283139',GradientType=1 ); /* IE6-9 fallback on horizontal gradient */


    background: #191d1e; /* Old browsers */
    background: -moz-linear-gradient(0deg #283139 100%, ,  #191d1e 50%,); /* FF3.6+ */
    background: -webkit-gradient(linear, left top, right bottom, color-stop(100%,#283139), color-stop(50%,#191d1e)); /* Chrome,Safari4+ */
    background: -webkit-linear-gradient(0deg,  #283139 100%,#191d1e 50%,); /* Chrome10+,Safari5.1+ */
    background: -o-linear-gradient(0deg, #283139 100%, #191d1e 50%); /* Opera 11.10+ */
    background: -ms-linear-gradient(0deg, #283139 100%, #191d1e 50%); /* IE10+ */
    background: linear-gradient(0deg,#283139 100%,  #191d1e 50%); /* W3C */
    filter: progid:DXImageTransform.Microsoft.gradient( startColorstr='#283139', endColorstr='#191d1e',GradientType=1 ); /* IE6-9 fallback on horizontal gradient */



/*    background-attachment: fixed*/
}

#projector {
  position: absolute; 
  top: 0px;
  left: 0px;
  width:100%;
  height:100%;
} 
.center-div {
    width:580px;
    height:374px;
    position:absolute;
    left:50%;
    top:50%;
    margin-left: -290px;
    margin-top:  -187px;
}
#preloaderDiv
{
    position:absolute;
    left:50%;
    top:50%;
    margin-left: -27px;
    margin-top:  -27px;
}
#logo{
    opacity:0;
    filter: alpha(opacity=0);
}
#date2014
{
    position:absolute;
    padding-left: 210px;
    padding-top:15px;
    opacity:0;
    top:303px;
    left:0;
    filter: alpha(opacity=0);
}
@media screen and (max-width: 850px) {
    div.non_si_sup_750 {
        display: none;    
    }
  
}
@media screen and (min-width: 851px) {
    div.noexemple {
        display: none;
    }
}