#filtre{
	max-height:0;
	overflow:hidden;
}
#filtre.ouvreFiltre{
	opacity:1;
	max-height:500px;
	animation: ouvertureFiltre 1s ease forwards;
}
#filtre.fermeFiltre{
	animation: fermetureFiltre 1s ease forwards;
}
@keyframes ouvertureFiltre{
	0%{
		max-height:0;
		opacity:0;
	}
	10%{
		max-height:50px;
		opacity:.5;
	}
	100%{
		max-height:600px;
		opacity:1;
	}
}
@keyframes fermetureFiltre{
	0%{
		max-height:600px;
		opacity:1;
	}
	100%{
		max-height:0;
		opacity:0;
	}
}