.card{
	height:15em;
}

.center{
	margin:0 auto;
}

.card .hidden {
	transition:height 0.5s, opacity 0.5s;
	height:0;
	opacity: 0;
}

.card:hover .hidden{
	height:5em;
	opacity: 1;
}

.hidden i{
	font-size: 5em;
}

#spinner{
	margin-top: 2em;
}