$grid-columns-rows-classes-map: ();

@for $i from 1 through $steller-grid-columns {
  $map: ();

  $map: map-merge(
    $map,
    (
      'col-#{$i}': (
        grid-column: 'span #{$i}'
      )
    )
  );

  $map: map-merge(
    $map,
    (
      'row-#{$i}': (
        grid-row: 'span #{$i}'
      )
    )
  );

  @for $j from 1 through $steller-grid-columns {
    $map: map-merge(
      $map,
      (
        'col-#{$i}-start-#{$j}': (
          grid-column: '#{$j} / span #{$i}'
        )
      )
    );
  }

  $grid-columns-rows-classes-map: map-merge($grid-columns-rows-classes-map, $map);
}