Bootstrap/less/grid.less

//
// Grid system
// --------------------------------------------------

// Set the container width, and override it for fixed navbars in media queries
.container {
  .container-fixed();
}

// Mobile-first defaults
.row {
  .make-row();
}

// Common styles for small and large grid columns
.col-1,
.col-2,
.col-3,
.col-4,
.col-5,
.col-6,
.col-7,
.col-8,
.col-9,
.col-10,
.col-11,
.col-12,
.col-sm-1,
.col-sm-2,
.col-sm-3,
.col-sm-4,
.col-sm-5,
.col-sm-6,
.col-sm-7,
.col-sm-8,
.col-sm-9,
.col-sm-10,
.col-sm-11,
.col-sm-12,
.col-lg-1,
.col-lg-2,
.col-lg-3,
.col-lg-4,
.col-lg-5,
.col-lg-6,
.col-lg-7,
.col-lg-8,
.col-lg-9,
.col-lg-10,
.col-lg-11,
.col-lg-12 {
  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);
}



//
// Container and grid column sizing
//

// Tiny device columns (smartphones)
.col-1,
.col-2,
.col-3,
.col-4,
.col-5,
.col-6,
.col-7,
.col-8,
.col-9,
.col-10,
.col-11,
.col-12 {
  float: left;
}
.col-1  { width: percentage((1 / @grid-columns)); }
.col-2  { width: percentage((2 / @grid-columns)); }
.col-3  { width: percentage((3 / @grid-columns)); }
.col-4  { width: percentage((4 / @grid-columns)); }
.col-5  { width: percentage((5 / @grid-columns)); }
.col-6  { width: percentage((6 / @grid-columns)); }
.col-7  { width: percentage((7 / @grid-columns)); }
.col-8  { width: percentage((8 / @grid-columns)); }
.col-9  { width: percentage((9 / @grid-columns)); }
.col-10 { width: percentage((10/ @grid-columns)); }
.col-11 { width: percentage((11/ @grid-columns)); }
.col-12 { width: 100%; }

// Small device columns (phones to tablets)
@media (min-width: @screen-tablet) {
  .container {
    max-width: @container-tablet;
  }

  .col-sm-1,
  .col-sm-2,
  .col-sm-3,
  .col-sm-4,
  .col-sm-5,
  .col-sm-6,
  .col-sm-7,
  .col-sm-8,
  .col-sm-9,
  .col-sm-10,
  .col-sm-11,
  .col-sm-12 {
    float: left;
  }
  .col-sm-1  { width: percentage((1 / @grid-columns)); }
  .col-sm-2  { width: percentage((2 / @grid-columns)); }
  .col-sm-3  { width: percentage((3 / @grid-columns)); }
  .col-sm-4  { width: percentage((4 / @grid-columns)); }
  .col-sm-5  { width: percentage((5 / @grid-columns)); }
  .col-sm-6  { width: percentage((6 / @grid-columns)); }
  .col-sm-7  { width: percentage((7 / @grid-columns)); }
  .col-sm-8  { width: percentage((8 / @grid-columns)); }
  .col-sm-9  { width: percentage((9 / @grid-columns)); }
  .col-sm-10 { width: percentage((10/ @grid-columns)); }
  .col-sm-11 { width: percentage((11/ @grid-columns)); }
  .col-sm-12 { width: 100%; }

  // Push and pull columns for source order changes
  .col-push-1  { left: percentage((1 / @grid-columns)); }
  .col-push-2  { left: percentage((2 / @grid-columns)); }
  .col-push-3  { left: percentage((3 / @grid-columns)); }
  .col-push-4  { left: percentage((4 / @grid-columns)); }
  .col-push-5  { left: percentage((5 / @grid-columns)); }
  .col-push-6  { left: percentage((6 / @grid-columns)); }
  .col-push-7  { left: percentage((7 / @grid-columns)); }
  .col-push-8  { left: percentage((8 / @grid-columns)); }
  .col-push-9  { left: percentage((9 / @grid-columns)); }
  .col-push-10 { left: percentage((10/ @grid-columns)); }
  .col-push-11 { left: percentage((11/ @grid-columns)); }

  .col-pull-1  { right: percentage((1 / @grid-columns)); }
  .col-pull-2  { right: percentage((2 / @grid-columns)); }
  .col-pull-3  { right: percentage((3 / @grid-columns)); }
  .col-pull-4  { right: percentage((4 / @grid-columns)); }
  .col-pull-5  { right: percentage((5 / @grid-columns)); }
  .col-pull-6  { right: percentage((6 / @grid-columns)); }
  .col-pull-7  { right: percentage((7 / @grid-columns)); }
  .col-pull-8  { right: percentage((8 / @grid-columns)); }
  .col-pull-9  { right: percentage((9 / @grid-columns)); }
  .col-pull-10 { right: percentage((10/ @grid-columns)); }
  .col-pull-11 { right: percentage((11/ @grid-columns)); }
}

// Medium and large device columns (desktop and up)
@media (min-width: @screen-desktop) {
  .container {
    max-width: @container-desktop;
  }
  .col-lg-1,
  .col-lg-2,
  .col-lg-3,
  .col-lg-4,
  .col-lg-5,
  .col-lg-6,
  .col-lg-7,
  .col-lg-8,
  .col-lg-9,
  .col-lg-10,
  .col-lg-11,
  .col-lg-12 {
    float: left;
  }
  .col-lg-1  { width: percentage((1 / @grid-columns)); }
  .col-lg-2  { width: percentage((2 / @grid-columns)); }
  .col-lg-3  { width: percentage((3 / @grid-columns)); }
  .col-lg-4  { width: percentage((4 / @grid-columns)); }
  .col-lg-5  { width: percentage((5 / @grid-columns)); }
  .col-lg-6  { width: percentage((6 / @grid-columns)); }
  .col-lg-7  { width: percentage((7 / @grid-columns)); }
  .col-lg-8  { width: percentage((8 / @grid-columns)); }
  .col-lg-9  { width: percentage((9 / @grid-columns)); }
  .col-lg-10 { width: percentage((10/ @grid-columns)); }
  .col-lg-11 { width: percentage((11/ @grid-columns)); }
  .col-lg-12 { width: 100%; }

  // Offsets
  .col-offset-1  { margin-left: percentage((1 / @grid-columns)); }
  .col-offset-2  { margin-left: percentage((2 / @grid-columns)); }
  .col-offset-3  { margin-left: percentage((3 / @grid-columns)); }
  .col-offset-4  { margin-left: percentage((4 / @grid-columns)); }
  .col-offset-5  { margin-left: percentage((5 / @grid-columns)); }
  .col-offset-6  { margin-left: percentage((6 / @grid-columns)); }
  .col-offset-7  { margin-left: percentage((7 / @grid-columns)); }
  .col-offset-8  { margin-left: percentage((8 / @grid-columns)); }
  .col-offset-9  { margin-left: percentage((9 / @grid-columns)); }
  .col-offset-10 { margin-left: percentage((10/ @grid-columns)); }
  .col-offset-11 { margin-left: percentage((11/ @grid-columns)); }
}

// Large desktops and up
@media (min-width: @screen-large-desktop) {
  .container {
    max-width: @container-large-desktop;
  }
}