php – 调整Yii2表单中的文本框大小

这是userForm.PHP的视图：

<?PHP

    use yii\helpers\HTML;
    use yii\widgets\ActiveForm;

    ?>
    <?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 app\models;

use yii\base\Model;

class UserForm extends Model
{

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

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