.tile {
    position: relative;
    float: left;
    width: 100%;
    height: 100%;
    overflow: hidden;
  }

  .photo {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-repeat: no-repeat;
    background-position: center;
    background-size: cover;
    transition: transform .5s ease-out;
  }