barebones/scss/objects/_scaffolding.scss

.container {
  margin: 0 auto;
  max-width: ($container-max-width - $column-gutter) * 1px;
  padding: 0 20px;
  @extend .clearfix;
}

.container-fluid {
  width: 100%;
  @extend .clearfix;
}

.row {
  margin-left: -($column-gutter / $container-max-width) * 100%;
  _overflow: hidden;
  @extend .clearfix;
  @include breakpoint(mobile) { 
    margin-left: 0; 
  }
}

.column {
  display: inline;
  float: left;
  margin-left: ($column-gutter / $container-max-width) * 100%;
  vertical-align: top;
  @include breakpoint(mobile) { 
    display: block;
    float: none;
    margin-left: 0;
    width: auto !important;
  }
}

@for $i from 1 through $column-count {
  .column-span-#{$i} { 
    width: (((100 / $column-count) * $i) - (($column-gutter / $container-max-width) * 100)) * 1%;
    *width: (((100 / $column-count) * $i) - (($column-gutter / $container-max-width) * 100)) - .02 * 1%;
  }
}

.row-no-gutters .column {
  margin-left: 0;
}

@for $i from 1 through $column-count {
  .row-no-gutters .column-span-#{$i} { 
    width: ((100 / $column-count) * $i) * 1%;
    *width: ((100 / $column-count) * $i) - .02 * 1%;
  }
}