@media (max-width: 781px) {
  .wp-block-columns:not(.is-not-stacked-on-mobile).mobile-reverse-order {
    flex-direction: column-reverse;
  }
  .wp-block-columns.is-not-stacked-on-mobile.mobile-reverse-order {
    flex-direction: row-reverse;
  }
}

@media (min-width: 782px) {
  .wp-block-columns.desktop-reverse-order {
    flex-direction: row-reverse;
  }
}