{%- with messages = get_flashed_messages(with_categories=true) -%}
  {% if messages %}
    <div style="position: fixed; top: 20px; right: 20px; width: 400px; z-index: 9999">
      {% for category, message in messages %}
      <div class="alert alert-{{ category }} alert-dismissible" role="alert">
        <button type="button" class="close" data-dismiss="alert" aria-label="{{ _('Close') }}"><span aria-hidden="true">&times;</span></button>
        {{ message }}
      </div>
      {% endfor %}
    </div>
  {% endif %}
{%- endwith %}