gitlab-org--gitlab-foss/app/assets/stylesheets/gitlab_bootstrap/forms.scss

form {
  @extend .form-horizontal;

  label {
    @extend .control-label;
  }
}

input {
  &.input-xpadding {
    padding: 6px 10px;
  }
}

.control-group {
  .control-label {
    padding-top: 6px;
  }
  .controls {
    input, textarea {
      padding: 6px 10px;
    }

    input[type="radio"], input[type="checkbox"] {
      margin-top: 6px;
    }
  }
}