Twitter Bootstrap col-xl less file

twbs-grid-xl

// XL screen
@screen-xl:                  1600px;
@screen-xl-min:              @screen-xl;
@screen-xl-hughdesktop:      @screen-xl-min;

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

//Container sizes
// Large screen / wide desktop
@container-xlarge-desktop:      ((1540px + @grid-gutter-width));
@container-xl:                 @container-xlarge-desktop;

// 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;
  }
}

.make-grid-xlcolumns() {
  // Common styles for all sizes of grid columns, widths 1-12
  .col(@index) when (@index = 1) { // initial
    @item: ~".col-xl-@{index}";
    .col((@index + 1), @item);
  }
  .col(@index, @list) when (@index =< @grid-columns) { // general; "=<" isn't a typo
    @item: ~".col-xl-@{index}";
    .col((@index + 1), ~"@{list}, @{item}");
  }
  .col(@index, @list) when (@index > @grid-columns) { // terminal
    @{list} {
      position: relative;
      // Prevent columns from collapsing when empty
      min-height: 1px;
      // Inner gutter via padding
      padding-left:  (@grid-gutter-width / 2);
      padding-right: (@grid-gutter-width / 2);
    }
  }
  .col(1); // kickstart it
}
.make-grid-xlcolumns();
@media (min-width: @screen-xl-min) {
	.make-grid(xl);
}
// Generate the large columns
.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));
  }
}
.make-xl-column-offset(@columns) {
  @media (min-width: @screen-xl-min) {
    margin-left: percentage((@columns / @grid-columns));
  }
}
.make-xl-column-push(@columns) {
  @media (min-width: @screen-xl-min) {
    left: percentage((@columns / @grid-columns));
  }
}
.make-xl-column-pull(@columns) {
  @media (min-width: @screen-xl-min) {
    right: percentage((@columns / @grid-columns));
  }
}