<div class="card">
  <img src="https://source.unsplash.com/800x680/?sky,cloud,blue" alt="">
</div>
div{
  margin:20px;
}
.card{
  width:400px;
  height:340px;
  display:flex;
  transform:rotateY(0deg);
  transition-duration:1s;
  transition-delay:0.2s;
}
.card:hover{
  transform:rotateY(180deg);
}




External CSS

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