body
{
	 background-size: cover;
	 background-image:url("lp-desk.gif");
	 height: 500px;
	 opacity:0;

}


.lien
{
height: 250%;
}

@media (max-width: 640px) 
{
body{
 background-size: cover;
 background-image:url("lp-mobile.gif")
}

.lien
{
height: 100%;
}

}