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.photo a:after {
  position: absolute;
  content: '';
  width: 100%;
  height: 100%;
  top: 0;
  left: 0;
  opacity: 0;
  background: url('../img/zoom-in.png') no-repeat center bottom rgba(61, 73, 79, 0.49);
}

.photo a:hover:after {
  background-position: center center;
  opacity: 1;
}