.wp-block-column {
  flex-basis: 100%;
  margin: 0 0 30px 0;
}

.wp-block-column:not(:first-child), .wp-block-column:nth-child(2n) {
  margin-left: 0;
}

.wp-block-column:not(:last-child) {
  margin-right: 0;
}

@media (min-width: 680px) {
  .wp-block-columns {
    flex-wrap: nowrap;
    margin-bottom: 30px;
  }

  .wp-block-column {
    flex-basis: 50%;
    margin: 0 15px;
  }

  .wp-block-column:first-child {
    margin-left: 0;
  }

  .wp-block-column:not(:last-child) {
    margin-right: 15px;
  }

  .wp-block-column:not(:first-child), .wp-block-column:nth-child(2n) {
    margin-left: 15px;
  }

  .wp-block-column:nth-child(odd) {
    margin-right: 15px;
  }

  .wp-block-column:last-child {
    margin-right: 0;
  }
}


@media (min-width: 780px) {

}