@media screen and (max-width: 780px) {
  .wp-block-columns.is-bordered-columns .wp-block-column {
    padding: 0 0 30px !important;
  }
}
@media screen and (max-width: 780px) {
  .wp-block-columns.is-bordered-columns .wp-block-column:first-of-type {
    border-right: none !important;
    border-bottom: 1px solid white;
  }
}