rewrite of func in ap-admin-theme

/**
 * Add CSS file link
 */
function wb_admin_css() {
    $url = plugins_url('/wp-admin.css', __FILE__);
    //$url = get_settings('siteurl') . '/wp-content/plugins/wp-admin-theme/wp-admin.css';
    // echo '
    // <link rel="stylesheet" type="text/css" href="' . $url . '" />
    // <link rel="stylesheet" href="/wp-admin/css/upload.css" type="text/css" />
    // ';
    wp_enqueue_style( 'wp-admin-theme', $url );
}