body {
  color: #555;
  font-size: 1.1em;
  font-family: 'Helvetica Neue', Helvetica, Arial, sans-serif;
}

hr {
  margin: 50px 0;
}

.container {
  margin: 40px auto;
  width: 300px;
  border: 1px solid #eee;
  -webkit-perspective: 800px;
  perspective: 800px;
}

.card {
  -webkit-transition: all .3s ease-out;
  transition: all .3s ease-out;
  width: 300px;
  height: 500px;
  position: relative;
  -webkit-transform-style: preserve-3d;
  transform-style: preserve-3d;
}

.container:hover .card {
  -webkit-transform: rotateY(180deg);
  transform: rotateY(180deg);
}

.front,
.back {
  -webkit-backface-visibility: hidden;
  backface-visibility: hidden;
  position: absolute;
  top: 0;
  left: 0;
  width: 300px;
  height: 500px;
  text-align: center;
  color: white;
  line-height: 500px;
  font-weight: bold;
}

.front {
  background-color: maroon;
  z-index: 2;
}

.back {
  z-index: 1;
  background-color: #7f8c8d;
  -webkit-transform: rotateY(180deg);
  transform: rotateY(180deg);
}