Issue with resizing fields of form under symfony 3 - php

Question

I have a problem with resizing the fields I've generated with symfony, my fields take the whole width of the page. Here is my code:
Controller :
$user= new User();
$form=$this->CreateFormBuilder($user)
->add("firstName",TextType::class)
->add("lastName",TextType::class)
->add("login",TextType::class)
->add("password",PasswordType::class)
->add("tel",TextType::class)
->add("email",TextType::class)
->add("address",TextType::class)
->add("send",SubmitType::class)
-> getForm();
$form->handleRequest($req);
if($form->isValid())
{
$em=$this->getDoctrine()->getManager();
$em->persist($user);
$em->flush();
}
return $this->render('eplateformeBundle:Default:register.html.twig',['form'=>$form->createView()]);
The view :
<div class="well">
{{ form_start(form ) }}
{{ form_errors(form) }}
{{ form_row(form.firstName) }}
{{ form_row(form.lastName) }}
{{ form_row(form.login) }}
{{ form_row(form.password) }}
{{ form_row(form.tel) }}
{{ form_row(form.email) }}
{{ form_row(form.address) }}
{{ form_widget(form.send, {'attr': {'class': 'btn btn-primary'}}) }}
{{ form_rest(form) }}
{{ form_end(form) }}
</div>

Answer 1

You can transfer own class to inputs fields like this:
<div class="well">
{{ form_start(form ) }}
{{ form_errors(form) }}
{{ form_row(form.firstName,{'attr':{'class':'your own class''}}) }}
{{ form_row(form.lastName,{'attr':{'class':'your own class''}}) }}
{{ form_row(form.login,{'attr':{'class':'your own class''}}) }}
{{ form_row(form.password,{'attr':{'class':'your own class''}}) }}
{{ form_row(form.tel,{'attr':{'class':'your own class''}}) }}
{{ form_row(form.email,{'attr':{'class':'your own class''}}) }}
{{ form_row(form.address,{'attr':{'class':'your own class''}}) }}
{{ form_widget(form.send, {'attr': {'class': 'btn btn-primary'}}) }}
{{ form_rest(form) }}
{{ form_end(form) }}
</div>