layout_15_gridAdvanced-mixin.scss

@mixin gridAdvanced($cols...) {
  @supports(grid-area: auto) {
    grid-template-columns: repeat($grid-columns, 1fr);

    $i: 1;
    @each $col in $cols {
      > :nth-of-type(#{$i}) {
        grid-column-start: nth($col,1);
        grid-column-end: nth($col,2);
        grid-row-start: nth($col,3);
        grid-row-end: nth($col,4);
      }
      $i: $i + 1;
    }
  }
}