bulma/docs/_includes/elements/snippet.html

<div class="
  bd-snippet
  {% if include.horizontal %}bd-is-horizontal{% else %}bd-is-vertical{% endif %}
  {% if include.fullwidth %}bd-is-fullwidth{% endif %}
  {% if include.clipped %}bd-is-clipped{% endif %}
  {% if include.size %}bd-is-size-{{ include.size }}{% endif %}
  ">
  <div class="bd-snippet-example">
    <p class="bd-snippet-title">
      <span class="bd-snippet-tag bd-is-example">Example</span>
    </p>

    <div class="bd-snippet-preview">
      {% if include.wrapper %}
        <div class="{{ include.wrapper }}">
          {{ include.content }}
        </div>
      {% else %}
        {{ include.content }}
      {% endif %}
    </div>
  </div>

  <div class="bd-snippet-source">
    <p class="bd-snippet-title">
      <span class="bd-snippet-tag bd-is-html">HTML</span>
    </p>

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