<div class="scene scene--card">
  <div class="card">
    <div class="card__face card__face--front">front</div>
    <div class="card__face card__face--back">back</div>
  </div>
</div>

.scene {
  width: 200px;
  height: 260px;
  margin: 40px 0;
  perspective: 600px;
}

.card {
  width: 100%;
  height: 100%;
  transition: transform 1s;
  transform-style: preserve-3d;
  cursor: pointer;
  position: relative;
}

.card::before{
  content: '';
  position: absolute;
  width: 49.5px;
  height: 100%;
  background-color: green;
  transform: rotateY(90deg);
  transform-origin: 0 100%;
}

.card.is-flipped {
  transform: rotateY(180deg);
}

.card__face {
  position: absolute;
  width: 100%;
  height: 100%;
  line-height: 260px;
  color: white;
  text-align: center;
  font-weight: bold;
  font-size: 40px;
  -webkit-backface-visibility: hidden;
  backface-visibility: hidden;
}

.card__face--front {
  background: red;
}

.card__face--back {
  background: blue;
  transform: translateZ(-49.5px) rotateY(180deg);
}

var card = document.querySelector('.card');
card.addEventListener( 'click', function() {
  card.classList.toggle('is-flipped');
});