{% if flash_messages is defined and flash_messages is not empty %}
  <div class="flash-stack" role="status" aria-live="polite">
    {% for flash in flash_messages %}
      <div class="alert alert-{{ flash.type == 'error' ? 'danger' : flash.type }}">
        {{ flash.message }}
      </div>
    {% endfor %}
  </div>
{% endif %}