bulma/docs/_includes/snippet.html

<div class="
  bd-snippet
  {% if include.horizontal %}bd-is-horizontal{% else %}bd-is-vertical{% endif %}
  {% if include.clipped %}bd-is-clipped{% endif %}
  {% if include.size %}bd-is-{{ include.size }}{% endif %}
  ">
  <div class="bd-snippet-preview">
    {{ include.content }}
  </div>
  <div class="bd-snippet-code {% unless include.clipped %}highlight-full{% endunless %}">
    {% highlight html %}{{ include.content }}{% endhighlight %}
  </div>
</div>