{% if app.request.hasPreviousSession %}
    <div class="messages">
        {% for type, messages in app.flashes %}
            {% for message in messages %}
                {# Bootstrap alert, see https://getbootstrap.com/docs/3.4/components/#alerts #}
                <div class="alert alert-danger alert-dismissible alert-{{ type }} fade in" role="alert">
                    <button type="button" class="close" data-dismiss="alert" aria-label="Close">
                        <span aria-hidden="true">&times;</span>
                    </button>

                    {{ message|trans }}
                </div>
            {% endfor %}
        {% endfor %}
    </div>
{% endif %}