Hide items that remains after a division by n.

_remaining-items.scss

// Hide items that remains after a division by n. 
// E.g.: when using remaining-items(3) on a set of 8 elements, the last two items will be hidden.

@mixin remaining-items($n-per-row) {

  &:nth-child(n+#{$n-per-row}) {

    &:nth-last-child(-n+#{$n-per-row}) {

      &:nth-child(#{$n-per-row}n+#{$n-per-row}) ~ * {
        @content;
      }
    }
  }
}