#content ul.thumbnails {
  display: block; /* Fallback for older themes */
  width: 100%;
  margin: 0;
  padding: 0;
  list-style: none;
}

#content ul.thumbnails li {
  float: left;
  width: 49%; /* Two columns with small gap */
  margin: 0.5%; /* Small margin between photos */
  box-sizing: border-box; /* Includes padding/borders in width */
}

#content ul.thumbnails li span.wrap1, #content ul.thumbnails li span.wrap2 {
  width: 100%; /* Full width for thumbnail containers */
}

@media (max-width: 768px) {
  #content ul.thumbnails li {
    width: 100%; /* Stack to one column on mobile */
  }
}