File: app/example/view/commons/login-form.phtml

<form action="<?=self::href('login')?>" method="POST">
   <div class="form-group">
      <label for="user">Usuário:</label>
      <div class="input-group input-group-lg">
         <span class="input-group-addon" id="basic-addon1"><i class="glyphicon glyphicon-user"></i></span>
         <input type="text" class="form-control" placeholder="Username" aria-describedby="basic-addon1" name="user">
      </div>
   </div>
   <div class="form-group">
      <label for="pass">Senha:</label>
      <div class="input-group input-group-lg">
         <span class="input-group-addon" id="basic-addon1"><i class="glyphicon glyphicon-lock"></i></span>
         <input type="password" class="form-control" placeholder="Username" aria-describedby="basic-addon1" name="pass">
      </div>
   </div>

   <div class="form-group">
      <button type="submit" class="btn btn-primary btn-lg btn-block">Entrar</button>
   </div>
</form>