<link href="//maxcdn.bootstrapcdn.com/bootstrap/3.3.0/css/bootstrap.min.css" rel="stylesheet" id="bootstrap-css">
<script src="//maxcdn.bootstrapcdn.com/bootstrap/3.3.0/js/bootstrap.min.js"></script>
<script src="//code.jquery.com/jquery-1.11.1.min.js"></script>
<form class="form-horizontal">
<fieldset>
<legend>Formulario</legend>
<div class="form-group">
<label class="col-md-4 control-label" for="nome">Nome</label>
<div class="col-md-5">
<input id="nome" name="nome" placeholder="" class="form-control input-md" required="" type="text">
</div>
</div>
<div class="form-group">
<label class="col-md-4 control-label" for="email">Email</label>
<div class="col-md-6">
<input id="email" name="email" placeholder="" class="form-control input-md" required="" type="text">
</div>
</div>
<div class="form-group">
<label class="col-md-4 control-label" for="login">Login</label>
<div class="col-md-5">
<input id="login" name="login" placeholder="" class="form-control input-md" required="" type="text">
</div>
</div>