html {
  height: 100%;
  width: 100%;
}

body {
  background: #eee -webkit-linear-gradient(315deg, #2980b9, #9b59b6);
  background: #eee linear-gradient(135deg, #2980b9, #9b59b6);
  display: -webkit-box;
  display: -ms-flexbox;
  display: flex;
  -webkit-box-align: center;
      -ms-flex-align: center;
          align-items: center;
  -webkit-box-pack: center;
      -ms-flex-pack: center;
          justify-content: center;
  height: 100%;
  width: 100;
}
body .blocks {
  position: relative;
  display: -webkit-box;
  display: -ms-flexbox;
  display: flex;
  -webkit-box-align: center;
      -ms-flex-align: center;
          align-items: center;
  -webkit-box-pack: center;
      -ms-flex-pack: center;
          justify-content: center;
}
body .blocks .block {
  position: relative;
  display: block;
  width: 200px;
  height: 200px;
  margin: 20px;
  -webkit-transform: perspective(600px) rotateY(-30deg);
          transform: perspective(600px) rotateY(-30deg);
  -webkit-transition: -webkit-transform .3s;
  transition: -webkit-transform .3s;
  transition: transform .3s;
  transition: transform .3s, -webkit-transform .3s;
}
body .blocks .block img {
  width: auto;
  max-width: 100%;
}
body .blocks .block .overlay {
  position: fixed;
  display: -webkit-box;
  display: -ms-flexbox;
  display: flex;
  -webkit-box-align: center;
      -ms-flex-align: center;
          align-items: center;
  -webkit-box-pack: center;
      -ms-flex-pack: center;
          justify-content: center;
  top: 0;
  right: 0;
  bottom: 0;
  left: 0;
  z-index: 2;
  background-color: rgba(0, 0, 0, 0.5);
  opacity: 0;
  -webkit-transition: opacity .3s ease;
  transition: opacity .3s ease;
}
body .blocks .block .overlay img {
  width: auto;
  max-width: 50%;
}
body .blocks .block.hover, body .blocks .block:hover {
  -webkit-transform: rotateY(0);
          transform: rotateY(0);
  cursor: pointer;
}
body .blocks .block.hover .overlay, body .blocks .block:hover .overlay {
  opacity: 1;
}
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