Generated by SassMeister.com.

SassMeister-input.scss

// ----
// Sass (v3.4.6)
// Compass (v1.0.1)
// ----

$gutters: (4 10 20);
@each $gutter in $gutters {
    .row-gutter-#{$gutter} {
        &,
        .form-horizontal & {
            margin-left: (-1px * $gutter/2);
            margin-right: (-1px * $gutter/2);
            .col {
                padding-left: 1px * ($gutter/2);
                padding-right: 1px * ($gutter/2);
            }

            .form-control-feedback {
                right: 1px * $gutter/2;
            }
        }
    }
}

SassMeister-output.css

.row-gutter-4, .form-horizontal .row-gutter-4 {
  margin-left: -2px;
  margin-right: -2px;
}
.row-gutter-4 .col, .form-horizontal .row-gutter-4 .col {
  padding-left: 2px;
  padding-right: 2px;
}
.row-gutter-4 .form-control-feedback, .form-horizontal .row-gutter-4 .form-control-feedback {
  right: 2px;
}

.row-gutter-10, .form-horizontal .row-gutter-10 {
  margin-left: -5px;
  margin-right: -5px;
}
.row-gutter-10 .col, .form-horizontal .row-gutter-10 .col {
  padding-left: 5px;
  padding-right: 5px;
}
.row-gutter-10 .form-control-feedback, .form-horizontal .row-gutter-10 .form-control-feedback {
  right: 5px;
}

.row-gutter-20, .form-horizontal .row-gutter-20 {
  margin-left: -10px;
  margin-right: -10px;
}
.row-gutter-20 .col, .form-horizontal .row-gutter-20 .col {
  padding-left: 10px;
  padding-right: 10px;
}
.row-gutter-20 .form-control-feedback, .form-horizontal .row-gutter-20 .form-control-feedback {
  right: 10px;
}