{{ form_start(form) }}
<div class="container">
    <div class="row">
        {% for checkbox in form.roles %}
            <div class="col-md-3 mb-3">
                <div class="form-check">
                    {{ form_widget(checkbox, { 'attr': { 'class': 'form-check-input' } }) }}
                    {{ form_label(checkbox, null, { 'label_attr': { 'class': 'form-check-label' } }) }}
                </div>
            </div>
        {% endfor %}
    </div>
    <button class="btn btn-primary mt-3">Enregistrer</button>

</div>
{{ form_end(form) }}