bulma/docs/_includes/newsletter.html

<section id="newsletter" class="hero is-primary">
  <div class="hero-body">
    <div class="container">
      <div class="columns is-vcentered">
        <div class="column is-one-third is-left">
          <p class="title">Bulma <strong>Newsletter</strong></p>
          <p class="subtitle">Get notified when v1 is ready!</p>
        </div>

        <div class="column">
          <form action="https://mail.jgthms.com/subscribe" method="POST" accept-charset="utf-8">
              <div class="field is-grouped">
                <div class="control has-icons-left is-expanded">
                  <input type="email" value="" name="email" class="input is-flat required email" placeholder="email address" required>
                  <span class="icon is-small is-left">
                    <i class="fas fa-envelope"></i>
                  </span>
                </div>
                <div class="control">
                  <div class="is-hidden">
                    <input type="text" name="hp" id="hp">
                  </div>
                  <input type="hidden" name="list" value="So5UY3O9gHJkq892bn763Tyf4A">
                  <input type="submit" value="Subscribe" name="submit" id="mc-embedded-subscribe" class="button is-white is-outlined">
                </div>
              </div>
          </form>
        </div>
      </div>
    </div>
  </div>
</section>