hugo-theme-more-contentful/assets/templates/site.scss

{{/*
  This is a site-specific styling that have to be generated.
*/}}

article > main {
  /*
  Select all links that are external.

  In this case, we'll just exclude all links that are...

  - All internal anchors.
  - All links that points to a relative path.
  - All origin-relative URLs.

  Also, all links that are explicitly marked as external are obviously
  considered.
   */
  a[href]:not(:where(
    a[href^="#"],
    a[href^="./"],
    a[href^="../"],
    a[href^="/"]:not(a[href^="//"]),
  ))::after, a[rel~="external"]::after {
    color: var(--base05);
    font-size: 0.50em;
    content: " [🡕]";
    vertical-align: super;
  }

  /* Internal links are not to be styled. */
  {{- $baseURL := urls.Parse $.Site.BaseURL }}
  a[href]:where(
    a[href^="http://{{- $baseURL.Host -}}"],
    a[href^="https://{{- $baseURL.Host -}}"],
    a[href$="{{- $baseURL.Host -}}"],
    a[href$="{{- $baseURL.Host -}}/"],
    a[href^="{{- $.Site.BaseURL -}}"],
  )::after {
    content: unset;
  }
}