app/templates/partials/flash.html

{% if flashes %}
  <section class="flash-stack" aria-live="polite">
    {% for flash in flashes %}
      <article class="flash flash-{{ flash.level }}">
        <span class="flash-dot"></span>
        <p>{{ flash.message }}</p>
      </article>
    {% endfor %}
  </section>
{% endif %}