Souke/frontend/assets/AppAsset.php

<?php
/**
 * @link http://www.yiiframework.com/
 * @copyright Copyright (c) 2008 Yii Software LLC
 * @license http://www.yiiframework.com/license/
 */

namespace frontend\assets;

use yii\web\AssetBundle;
use yii ;

/**
 * @author Qiang Xue <qiang.xue@gmail.com>
 * @since 2.0
 */

class AppAsset extends \common\components\MyAssetBundle
{
    public $basePath = '@webroot';
    public $baseUrl = '@web';
    public $css = [];
    public $js = [];
    public $depends = [];
    
    public function __construct() {
        parent::__construct() ;
        
        // css
        $this->addAsset('css','css/screen.css');

        // js
        
    }
}