php – 调整Yii2表单中的文本框大小

这是userForm.php的视图：

<?php

    use yiihelpersHTML;
    use yiiwidgetsActiveForm;

    ?>
    <?php
        if(Yii::$app->session->hasFlash('success'))
        {
            echo Yii::$app->session->getFlash('success');
        }
    ?>
    <?php $form = ActiveForm::begin();?>
    <?= $form->field($model,'Lan_Id');?>
    <?= $form->field($model,'Name');?>
    <?= $form->field($model,'Employee_Number');?>
    <?= Html::submitButton('Submit',['class'=>'btn btn-success']);

这是模型UserForm.php：

<?php

namespace appmodels;

use yiibaseModel;

class UserForm extends Model
{

    public $Lan_Id;
    public $Name;
    public $Employee_Number;

    public function rules()
    {
        return [
            [['Lan_Id','Name','Employee_Number'],'required'],];
    }
}