Flip card

<!--full credit goes to eddy sims on codepen! feel free to check his stuff out :) https://codepen.io/edeesims
i simply cleaned this up for the convenience of those who want it to be a blank slate from the get go
-->
<style>
.card {
  position: absolute;
  top: 50%;
  left: 50%;
  width: 300px;
  height: 300px;
  margin: -150px;
  float: left;
  perspective: 500px;
}
.content {
  position: absolute;
  width: 100%;
  height: 100%;
  border: 1px solid black;
  transition: transform 1s;
  transform-style: preserve-3d;
}
.card:hover .content {
  transform: rotateY( 180deg ) ;
  transition: transform 0.5s;
}
.front,
.back {
  position: absolute;
  height: 100%;
  width: 100%;
  background: white;
  backface-visibility: hidden;
}
.back {
  background: white;
  transform: rotateY( 180deg );
}
</style>
<div class="card">
  <div class="content">
    <div class="front">
      Front
    </div>
    <div class="back">
      Back!
    </div>
  </div>
</div>