{{ form_start(form, {'attr': {'class': 'sp_modal sp_modal__warn sp_form__xhr'}}) }}
    <div class="sp_modal__body">
        <div>Do you really want to delete this node?</div>
        <div>This action can't be canceled.</div>
    </div>

    <div class="sp_form-row__button">
        <button class="sp_button" data-type="validate" type="button">
            <span>Cancel</span>
        </button>
        <button class="sp_button" data-type="cancel" type="submit">
            <span>Delete</span>
        </button>
    </div>
{{ form_end(form) }}