{{ form_start(form, {'attr': {'novalidate':'novalidate'}}) }}

<div class="row">
    <div class="col-md-12">
        {{ form_row(form.content) }}
    </div>
</div>
<div class="row">
    <div class="col-sm-6">
        {{ form_row(form.lifetime) }}
    </div>
    <div class="col-sm-6">
        {{ form_row(form.emailAddress) }}
    </div>
</div>


<input type="submit" value="Jetzt Einmal-Link generieren" class="btn btn-success btn-lg btn-block" />

{{ form_end(form) }}