Dracula
<link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/highlight.js/9.15.9/styles/dracula.min.css"/>
Highlight
<script src="https://cdnjs.cloudflare.com/ajax/libs/highlight.js/9.15.9/highlight.min.js"></script>
Adicionar este fragmento ao código:
<script>
// hljs.configure({useBR: true});
hljs.initHighlightingOnLoad();
</script>