I'm extending FOSUserBundle's user registration form. I have it looking and working the way I want, with one exception - validation. Errors appear, but the fields don't show red/green borders upon submission for invalid/valid inputs, and the errors themselves are presented in unordered lists with no styling rather than divs with error colors. Is there a simple way of getting it to look how I want? My form's Twig code:

```
{{ form_start(form, {'method': 'post', 'action': path('fos_user_registration_register'), 'attr': {'class': 'fos_user_registration_register'}}) }}
    <fieldset>
        <legend>Login Info</legend>
        <div class="form-group">
            {{ form_label(form.username) }}
            {{ form_widget(form.username, { 'attr': {'class': 'form-control'} }) }}
            {{ form_errors(form.username) }}
        </div>
        <div class="form-group">
            {{ form_label(form.email) }}
            {{ form_widget(form.email, { 'attr': {'class': 'form-control'} }) }}
            {{ form_errors(form.email) }}
        </div>
        <div class="form-group">
            {{ form_label(form.plainPassword.first) }}
            {{ form_widget(form.plainPassword.first, { 'attr': {'class': 'form-control'} }) }}
            {{ form_errors(form.plainPassword.first) }}
        </div>
        <div class="form-group">
            {{ form_label(form.plainPassword.second) }}
            {{ form_widget(form.plainPassword.second, { 'attr': {'class': 'form-control'} }) }}
            {{ form_errors(form.plainPassword.second) }}
        </div>
    </fieldset>

    <fieldset>
        <legend>Shipping Address</legend>
        <div class="form-group">
            {{ form_label(form.name) }}
            {{ form_widget(form.name, {'attr': {'class': 'form-control'}}) }}
            {{ form_errors(form.name) }}
        </div>
        <div class="form-group">
            {{ form_label(form.line1) }}
            {{ form_widget(form.line1, {'attr': {'class': 'form-control'}}) }}
            {{ form_errors(form.line1) }}
        </div>
        <div class="form-group">
            {{ form_label(form.line2) }}
            {{ form_widget(form.line2, {'attr': {'class': 'form-control'}}) }}
            {{ form_errors(form.line2) }}
        </div>
        <div class="form-row">
            <div class="form-group col-6">
                {{ form_label(form.city) }}
                {{ form_widget(form.city, {'attr': {'class': 'form-control'}}) }}
                {{ form_errors(form.city) }}
            </div>
            <div class="form-group col-4">
                {{ form_label(form.state) }}
                {{ form_widget(form.state, {'attr': {'class': 'form-control'}}) }}
                {{ form_errors(form.state) }}
            </div>
            <div class="form-group col-2">
                {{ form_label(form.zipcode) }}
                {{ form_widget(form.zipcode, {'attr': {'class': 'form-control'}}) }}
                {{ form_errors(form.zipcode) }}
            </div>
        </div>
        <div class="form-group">
            {{ form_label(form.phone) }}
            {{ form_widget(form.phone, {'attr': {'class': 'form-control'}}) }}
            {{ form_errors(form.phone) }}
        </div>
    </fieldset>

    <small>We only ship within the US</small>

    <div>
        <button type="submit" id="register-submit-btn" class="btn btn-burnt-orange">Register account</button>
    </div>
    {{ form_rest(form) }}
{{ form_end(form) }}

```