@function grid-column-offset($columnCount, $gutter, $breakpointWidth) {
  $gutter: $gutter * 1px;
  $gutters: ($columnCount - 1) * $gutter;
  $guttersOffset: ($breakpointWidth) * $gutter;

  @return calc((((100% - #{$gutters}) / #{$columnCount}) * #{$breakpointWidth}) + #{$guttersOffset});
}