@media (max-width: 599px) {
  article img[align=left],
  .img_caption.left,
  article img[align=right],
  .img_caption.right,
  .img-fulltext-left,
  .img-fulltext-right {
    float: none !important;
    margin-left: 0;
    margin-right: 0;
    width: 100% !important;
  }
}