.brexit-checker-results-page {
  .govuk-section-break--bold {
    border-bottom: 3px solid govuk-colour('blue');
  }

  .govuk-section-break--visible-mobile-only {
    @include govuk-media-query($from: tablet) {
      display: none;
    }
  }

  .brexit-checker-actions__description {
    padding: govuk-spacing(4);
    background-color: govuk-colour('grey-4');
  }

  .stay-updated__heading,
  .action-audience__heading {
    @include govuk-font($size: 27, $weight: bold);

    @include govuk-media-query($until: tablet) {
      @include govuk-font($size: 36, $weight: bold);
      @include govuk-responsive-margin(6, "bottom");
    }
  }
}

.brexit-checker-results-page {
  .brexit-checker-results {
    margin-top: govuk-spacing(6);
  }

  .brexit-checker-actions {
    margin-top: govuk-spacing(6);
    margin-bottom: govuk-spacing(6);
  }

  .brexit-checker__action {
    margin: 0 0 govuk-spacing(6);
  }

  .brexit-checker__content-wrapper {
    padding: 0 0 15px 0;
    border-bottom: 1px solid $govuk-border-colour;
  }

  .brexit-checker__action:last-child .brexit-checker__content-wrapper {
    border-bottom: none;
  }

  .govuk-section-break--bold {
    border-bottom: 3px solid $govuk-brand-colour;
  }

  .govuk-section-break--visible-mobile-only {
    @include govuk-media-query($from: tablet) {
      display: none;
    }
  }

  .brexit-checker-actions__description {
    padding: govuk-spacing(4);
    background-color: govuk-colour('grey-4');
  }

  .brexit-checker-actions__group {
    padding-top: govuk-spacing(6);
    border-bottom: 1px solid $govuk-border-colour;
    @include govuk-media-query($until: tablet) {
      padding-top: govuk-spacing(4);
    }
  }
  .brexit-checker-actions__group:last-child {
    border-bottom: none;
  }

  .stay-updated__heading {
    margin-top: govuk-spacing(6);
  }

  .brexit-checker__no-results {
    margin-top: govuk-spacing(6);
  }

  .action-audience__heading {
    border-top: 3px solid $govuk-brand-colour;
    border-bottom: 1px solid $govuk-border-colour;
    padding: govuk-spacing(4) 0;
    margin-bottom: 0;
  }
}

Add css for new results page group styling
Add css for new results page group styling

Copied across as a block from an older iteration on this PR it includes the css to

- Style the new header sections as full width for audiences

- Group sections withorizontal rules between

- Style the subheading titles above criteria
