v1/web/modules/contrib/bootstrap_styles/scss/admin-general-styles.scss

// Reusable classes.
@media only screen and (min-width: 1200px) {
  .bs-admin-d-lg-flex {
    display: flex;
  }

  .bs-admin-group-form-item-lg-ml {
    .form-item {
      &:not(:first-child) {
        margin-left: 1.5rem;
      }
    }
  }
}