#screen{
  visibility:hidden;
  position:absolute;
  top:20px;
  left:0px;
  text-align:center;
  height:80%;
  width:99%;
}

#screen img{ 
  margin-left:auto;
  margin-right:auto;
  text-align:center; /* IE */
  border: 2px solid #FF6A00;
  opacity:1 !important;
}

#ecran{
  visibility:hidden;
  /* Tout les navigateur CSS 3 */
  background-color: rgba(0,0,0,0.5) !important;
  /* Internet Explorer */
  filter:progid:DXImageTransform.Microsoft.gradient(startColorstr=#99000000,endColorstr=#99000000);
  zoom:1;
  position:absolute;
  top:0px;
  left:0px;
  height:100%;
  width:100%;
}

html>/**/body #ecran{
  /* Tous les autres */
  background-color:rgb(0,0,0);
  opacity:0.7;
}