// bootstrap gutter
// ex: .row.gutter-10
@for $num from 1 through 5
  $v: $num * 5px / 2
  .gutter-#{$num*5}
    margin-left: #{$v * -1}
    margin-right: #{$v * -1}
    > [class*='col-']
      padding-left: $v
      padding-right: $v
      padding-bottom: #{$num * 5px}