bulma/docs/_includes/subnav-components.html

<nav class="nav has-shadow">
  <div class="container">
    <div class="nav-left">
      <a class="nav-item is-tab {% if page.doc-subtab == 'card' %}is-active{% endif %}" href="{{ site.baseurl }}/documentation/components/card/">
        Card
      </a>
      <a class="nav-item is-tab {% if page.doc-subtab == 'level' %}is-active{% endif %}" href="{{ site.baseurl }}/documentation/components/level/">
        Level
      </a>
      <a class="nav-item is-tab {% if page.doc-subtab == 'media-object' %}is-active{% endif %}" href="{{ site.baseurl }}/documentation/components/media-object/">
        Media object
      </a>
      <a class="nav-item is-tab {% if page.doc-subtab == 'menu' %}is-active{% endif %}" href="{{ site.baseurl }}/documentation/components/menu/">
        Menu
      </a>
      <a class="nav-item is-tab {% if page.doc-subtab == 'message' %}is-active{% endif %}" href="{{ site.baseurl }}/documentation/components/message/">
        Message
      </a>
      <a class="nav-item is-tab {% if page.doc-subtab == 'modal' %}is-active{% endif %}" href="{{ site.baseurl }}/documentation/components/modal/">
        Modal
      </a>
      <a class="nav-item is-tab {% if page.doc-subtab == 'nav' %}is-active{% endif %}" href="{{ site.baseurl }}/documentation/components/nav/">
        Nav
      </a>
      <a class="nav-item is-tab {% if page.doc-subtab == 'pagination' %}is-active{% endif %}" href="{{ site.baseurl }}/documentation/components/pagination/">
        Pagination
      </a>
      <a class="nav-item is-tab {% if page.doc-subtab == 'panel' %}is-active{% endif %}" href="{{ site.baseurl }}/documentation/components/panel/">
        Panel
      </a>
      <a class="nav-item is-tab {% if page.doc-subtab == 'tabs' %}is-active{% endif %}" href="{{ site.baseurl }}/documentation/components/tabs/">
        Tabs
      </a>
    </div>
  </div>
</nav>