.photomask img {
  display: block;
  width: 100%;
  height: auto;

  -webkit-mask-image: url('../images/mask.png');
  -webkit-mask-repeat: no-repeat;
  -webkit-mask-position: center;
  -webkit-mask-size: 100% 100%;

  mask-image: url('../images/mask.png');
  mask-repeat: no-repeat;
  mask-position: center;
  mask-size: 100% 100%;
}