.flip-container {
  -moz-perspective: 1000;
  -webkit-perspective: 1000;
  perspective: 1000;
}
  
   
  .flip-container.hover .flipper {
    -moz-transform: rotateY(180deg);
    -webkit-transform: rotateY(180deg);
    transform: rotateY(180deg);
  }

.flipper {
  -moz-transition: 0.6s;
  -webkit-transition: 0.6s;
  transition: 0.6s;
  
  -moz-transform-style: preserve-3d;
  -webkit-transform-style: preserve-3d;
  transform-style: preserve-3d;

  position: relative;
}


.front-face, .back-face {
  -moz-backface-visibility: hidden;
  -webkit-backface-visibility: hidden;
  backface-visibility: hidden;

  position: absolute;
  top: 0;
  left: 0;
}


.front-face {
  z-index: 2;
}


.back-face {
  -moz-transform: rotateY(180deg);
  -webkit-transform: rotateY(180deg);
  transform: rotateY(180deg);
}