bulma/docs/_includes/global/deprecated.html

{% if site.deprecated %}
  <div class="notification is-info" style="border-radius: 0; margin-bottom: 0;">
    <p>
      You are viewing the deprecated <strong>{{site.data.meta.version}}</strong> version of the website.
      <a href="/">Click here to view the latest version</a>
    </p>
  </div>
{% endif %}