cookbook/themes/hugo-bulma-cookbook/layouts/partials/hero.html

<section class="hero is-primary">

  <div class="hero-body">
    <div class="container has-text-centered">
      <p class="title">
        {{ .Title }}
      </p>
      <p class="subtitle">
        {{ .Params.subtitle}}
      </p>
    </div>
  </div>

</section>