templates/partials/flash.html.twig line 1

{% for label, messages in app.flashes %}
    {% for message in messages %}
        <div class="alert alert-{{ label }} alert-dismissible fade show" role="alert">
            {{ message }}
            <button type="button"
                    class="close"
                    data-dismiss="alert"
                    aria-label="Close">
                <span aria-hidden="true">&times;</span>
            </button>
        </div>
    {% endfor %}
{% endfor %}