Why are styles not working in yii2?

Question

Yii

I can't connect styles to
main.php site

<?php

/* @var $this \yii\web\View */
/* @var $content string */

use yii\helpers\Html;
use yiibootstrap\Nav;
use yii\bootstrap\NavBar;
use yii\widgets\Breadcrumbs;
use frontend\assets\AppAsset;
use common\widgets\Alert;

AppAsset::register($this);
?>
<?php $this->beginPage() ?>

AppAsset.php

<?php

namespace frontend\assets;

use yii\web\AssetBundle;

/**
 * Main frontend application asset bundle.
 */
class AppAsset extends AssetBundle
{
    public $basePath = '@webroot';
    public $baseUrl = '@web';
    public $css = [
        'public/css/style.css',
    ];
    public $js = [
    ];
    public $depends = [
        'yii\web\YiiAsset',
        'yii\bootstrap\BootstrapAsset',
    ];
}

What could be the matter, it seems that I also do everything according to the documentation