body {
  font: 600 14px/24px "Open Sans", "HelveticaNeue-Light", "Helvetica Neue Light", "Helvetica Neue", Helvetica, Arial, "Lucida Grande", Sans-Serif;
  margin: 12px 12px;
}
.card-container {
  cursor: pointer;
  height: 200px;
  perspective: 600;
  position: relative;
  width: 200px;
}
.card {
  height: 100%;
  position: absolute;
  transform-style: preserve-3d;
  transition: all 1s ease-in-out;
  width: 100%; 
}
.card:hover {
  transform: rotateY(180deg);
}
.card .side {
  backface-visibility: hidden;
  border:#CCC thin solid; 
  border-radius: 6px;
  height: 100%;
  position: absolute;
  overflow: hidden;
  width: 100%; 
}
.card .back {
  background: #eaeaed;
  color: #0087cc;
  line-height: 150px;
  text-align: center;
  transform: rotateY(180deg);
}

.unaColonna{
	position:relative;
	/*width:100%;*/
	max-width:640px;
	height:200px;
}
.treColonne{
	position:relative;
	width:33%;
	height:200px;
	float:left;
	padding-bottom:10px;
}

.center {
    margin: 0;
    position: absolute;
    left: 50%;
    transform: translate(-50%);
}