body {
  background: #1976D2;
}

.wrapper {
  display: inline-block;
  background: #01579B;
  box-shadow: 0 3px 6px rgba(0,0,0,0.16), 0 3px 6px rgba(0,0,0,0.23);
  position: absolute;
  top: 50%;
  left: 50%;
  margin-top: -120px;
  margin-left: -180px;
}

/* entire container, keeps perspective */
.flip-container {
  display: inline-block;
  perspective: 1000px;
  vertical-align: top; /* Prevent unwanted margin. */
}

/* flip the pane when hovered */

.wrapper:hover .flip-left {
  transform: rotateY(-180deg);
}

.wrapper:hover .flip-right {
  transform: rotateY(180deg);
}

.flip-container,
.front,
.back {
  width: 180px;
  height: 240px;
}

/* flip speed goes here */
.flip {
  transition: 0.6s;
  transform-style: preserve-3d;
  position: relative;
}

/* hide back of pane during swap */
.front,
.back {
  backface-visibility: hidden;
  position: absolute;
  top: 0;
  left: 0;
}

/* front pane, placed above back */
.front {
  z-index: 2;
  background: #2196F3;
  transform: rotateY(0deg);
  overflow: hidden;
  /*position: relative;*/
}

.front-left .circle {
  position: absolute;
  right: -50px;
  top: 50%;
  margin-top: -50px;
}

.front-right .circle {
  position: absolute;
  left: -50px;
  top: 50%;
  margin-top: -50px;
}

.circle {
  position: absolute;
  width: 100px;
  height: 100px;
  border-radius: 100%;
  background: #ffffff;  box-shadow: 0 19px 38px rgba(0,0,0,0.20), 0 15px 12px rgba(0,0,0,0.12);

}

/* back, initially hidden pane */
.back {
  background: rgb(220,220,220);
  transform: rotateY(180deg);
  overflow: hidden;
}

img {
  width: 360px;
  height: 240px;
}

.back-left img {
  position: absolute;
  left: 0;
}

.back-right img {
  position: absolute;
  right: 0;
}