afpy.org/afpy/templates/_parts/flashes.jinja2

{% block flashes %}
    {% with messages = get_flashed_messages(with_categories=true) %}
        {% if messages %}
            {% 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>
                    <!-- <strong>Title</strong> --> {{ message }}
                </div>
            {% endfor %}
        {% endif %}
    {% endwith %}
{% endblock %}