.photo-row {
    display: -ms-flexbox; /* IE10 */
    display: flex;
    -ms-flex-wrap: wrap; /* IE10 */
    flex-wrap: wrap;
    padding: 0 4px;
  }
  
  /* Create equal columns that sits next to each other */
  .photo-column {
    -ms-flex: 33%; /* IE10 */
    flex: 33%;
    max-width: 33%;
    padding: 0 4px;
  }
  
  .photo-column img {
    margin-top: 8px;
    vertical-align: middle;
    width: 100%;
  }
  
  /* Responsive layout - makes a two column-layout instead */
  @media screen and (max-width: 800px) {
    .photo-column {
      -ms-flex: 50%;
      flex: 50%;
      max-width: 50%;
    }
  }
  
  /* Responsive layout - makes the two columns stack on top of each other instead of next to each other */
  @media screen and (max-width: 600px) {
    .photo-column {
      -ms-flex: 100%;
      flex: 100%;
      max-width: 100%;
    }
  }