#photos {
  /* vertical gaps */
  line-height: 3;
   
  -webkit-column-count: 2;
  -webkit-column-gap:   20px;
  -moz-column-count:    2;
  -moz-column-gap:      20px;
  column-count:         2;
  column-gap:           20px;  
}

#photos img {
  /* Just in case there are inline attributes */
  width: 100% !important;
  height: auto !important;
}

@media (max-width: 1200px) {
  #photos {
  -moz-column-count:    2;
  -webkit-column-count: 2;
  column-count:         2;
  }
}
@media (max-width: 1000px) {
  #photos {
  -moz-column-count:    2;
  -webkit-column-count: 2;
  column-count:         2;
  }
}
@media (max-width: 800px) {
  #photos {
  -moz-column-count:    2;
  -webkit-column-count: 2;
  column-count:         2;
  }
}
@media (max-width: 480px) {
  #photos {
  -moz-column-count:    1;
  -webkit-column-count: 1;
  column-count:         1;
  }
}

/* pen class link colour keep in this order ud */
a.pen:link {color: #000000; text-decoration: none;} /* unvisited links */
a.pen:hover {color: #0074e7; text-decoration: none;} /* user hovers */