wagtail/client/scss/components/_summary.scss

.w-summary {
  color: theme('colors.text-link-default');
  margin-bottom: theme('spacing.3');
  padding-top: theme('spacing.1');

  .w-summary__list {
    @include unlist();

    display: flex;
    flex-wrap: wrap;
    column-gap: theme('spacing.8');
  }

  /* Summary item */
  li {
    display: flex;
    align-items: center;
    flex-wrap: nowrap;
    gap: theme('spacing.[2.5]');
    margin-bottom: theme('spacing.6');
  }

  .icon {
    @include svg-icon(1.375rem);
    color: theme('colors.icon-primary');
  }

  a {
    text-decoration: underline;
    text-underline-offset: 3px;
  }
}