mylloon.fr/templates/libs/hljs_footer.html

<script src="//cdnjs.cloudflare.com/ajax/libs/highlight.js/11.7.0/highlight.min.js"></script>
<script src="//unpkg.com/highlightjs-copy/dist/highlightjs-copy.min.js"></script>
<script>
  hljs.configure({
    noHighlightRe: /^$/i,
    languageDetectRe: /\blanguage-hljs-([\w-]+)\b/i,
  });

  hljs.addPlugin(new CopyButtonPlugin());
  hljs.highlightAll();
</script>