{{ form_start(form) }}
<div class="my-custom-class-for-errors">
    {{ form_errors(form) }}
</div>

<dl class="">
    <dt id="blgEmail-label">{{ form_label(form.blgEmail) }}</dt>
    <dd id="blgEmail-element" class="col">
        {{ form_widget(form.blgEmail) }}
    </dd>

    <dt id="blgSubmit-label">{{ form_label(form.blgSubmit) }}</dt>
    <dd id="blgSubmit-element" class="col">
        {{ form_widget(form.blgSubmit) }}
    </dd>
</dl>
{{ form_end(form) }}