html { 
  margin:0;
  padding:0;
  background: url(../pics/fond/fond.jpg) no-repeat center fixed; 
  -webkit-background-size: cover;
  background-size: cover;
}




video.fdvid {
  position: fixed; left: 0; top: 0;
  min-width: 100%; min-height: 100%;
  z-index: -100;
  background: url(../pics/fond/fond.jpg) no-repeat center fixed;
  background-size: cover;
  -webkit-background-size: cover;
}