SOURCE

<div>
</div>

*,
body {
  padding: 0;
  margin: 0;
  font-size: 0;
}

div {
  box-sizing: border-box;
  position: absolute;
  top: 50%;
  left: 50%;
  width: 220px;
  height: 150px;
  border: 10px solid #333;
  border-radius: 2px;
  background: linear-gradient(to right, #333 0px, #333 10px, transparent 10px) #fff 95px 0/100%;
  transform: translate(-50%, -50%);
  transform-style: preserve-3d;
  perspective: 600px;
}

@keyframes flip {
  0% {
    background-size: 0% 80%;
    transform: rotateY(0deg);
  }
  25% {
    background-size: 75% 80%;
    transform: rotateY(0deg);
  }
  100% {
    background-size: 75% 80%;
    transform: rotateY(-180deg);
  }
}

div::before,
div::after {
  box-sizing: border-box;
  content: '';
  position: absolute;
  top: -10px;
  right: -10px;
  width: 110px;
  height: 150px;
  border: 10px solid #333;
  border-left-width: 5px;
  border-radius: 2px;
  background: repeating-linear-gradient(to bottom, #333, #333 8px, white 8px, white 16px) center/75% 80% no-repeat #fff;
  transform-origin: top left;
  animation: flip 3s ease infinite;
}

div::after {
  left: -10px;
  border-left-width: 10px;
  border-right-width: 5px;
  animation: none;
}