A SASS stylesheet that adds a xl-column to the bootstrap grid system

_bootstrap_xl.scss

@import "bootstrap";

// XLarge screen / wide desktop
//** Deprecated `$screen-xl` as of v3.0.1
$screen-xl:                  1600px !default;
$screen-xl-min:              $screen-xl !default;
$screen-xl-desktop:          $screen-xl-min !default;

// So media queries don't overlap when required, provide a maximum
$screen-lg-max:              ($screen-xl-min - 1) !default;

//== Container sizes
// XLarge screen / wide desktop
$container-xlarge-desktop:      (1540px + $grid-gutter-width) !default;
//** For `$screen-xl-min` and up.
$container-xl:                 $container-xlarge-desktop !default;

// Container widths
// Set the container width, and override it for fixed navbars in media queries.
.container {
  @media (min-width: $screen-xl-min) {
    width: $container-xl;
  }
}

@mixin make-grid-xlcolumns($i: 1, $list: ".col-xs-#{$i}, .col-sm-#{$i}, .col-md-#{$i}, .col-lg-#{$i}, .col-xl-#{$i}") {
  @for $i from (1 + 1) through $grid-columns {
    $list: "#{$list}, .col-xs-#{$i}, .col-sm-#{$i}, .col-md-#{$i}, .col-lg-#{$i}, .col-xl-#{$i}";
  }
  #{$list} {
    position: relative;
    // Prevent columns from collapsing when empty
    min-height: 1px;
    // Inner gutter via padding
    padding-left:  ceil(($grid-gutter-width / 2));
    padding-right: floor(($grid-gutter-width / 2));
  }
}

@include make-grid-xlcolumns;

@media (min-width: $screen-xl-min) {
  @include make-grid(xl);
}

// Generate the large columns
@mixin make-xl-column($columns, $gutter: $grid-gutter-width) {
  position: relative;
  min-height: 1px;
  padding-left:  ($gutter / 2);
  padding-right: ($gutter / 2);

  @media (min-width: $screen-xl-min) {
    float: left;
    width: percentage(($columns / $grid-columns));
  }
}
@mixin make-xl-column-offset($columns) {
  @media (min-width: $screen-xl-min) {
    margin-left: percentage(($columns / $grid-columns));
  }
}
@mixin make-xl-column-push($columns) {
  @media (min-width: $screen-xl-min) {
    left: percentage(($columns / $grid-columns));
  }
}
@mixin make-xl-column-pull($columns) {
  @media (min-width: $screen-xl-min) {
    right: percentage(($columns / $grid-columns));
  }
}