article #main-content {
  max-width: calc(18 * var(--unit--horizontal));
  scroll-margin-block-start: calc(var(--unit--vertical) * 6);
  margin-top: calc(var(--unit--vertical) * 2);
  padding-bottom: calc(var(--unit--vertical) * 2);
}

@media screen and (min-width: 640px) {
  article #main-content {
    max-width: auto;
  }
}