#j9gif{
	position:absolute;
  top:10%;left:16px;
  width:774px;height:195px;
  object-fit: contain;
    background-image: url(bird.gif);
    background-position:center center;
    background-repeat: no-repeat;
    background-size: contain; 
    z-index: 50;
}
#j9stop{
position:absolute;
  top:10%;left:16px;
  width:774px;height:195px;
  object-fit: contain;
  opacity:0;
    z-index: 50;
}
#j9fond{
    top:50%;left:50%;
    position:absolute;
    width:800px;height:600px;
    margin-left:-400px;
    margin-top:-300px;
    object-fit: scale-down;
    background-image: url(fenetre.png);
    background-position:center center;
    background-repeat: no-repeat;
    background-size: cover;  
}