@media (max-width: 800px) {
  .gallery-item {
    float: none;
    display: block;
    width: 100%;
    max-width: 100% !important;
    margin-top: 10px;
    text-align: center; }
  .gallery-item img {
    max-width: 100%;
    height: auto;
    width: 100%; } }