.container{
  position: relative;
  width: 200px;
  height: 200px;
  transform-style: preserve-3d;
  transition: all 1s;
}
.front-view, .back-view{
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  top: 0;
  color: white;
  text-align: center;
  display: grid;
  place-items: center;
  backface-visibility: hidden;
}
.front-view{
  background-color: green;
  transform: rotateY(180deg);
}
.back-view{
  background-color: red;
}
.container:hover{
  transform: rotateY(180deg);
  cursor: pointer;
}