wp排队风格不适用于儿童主题wordpress

Question

我刚上班，接受了wordpress的培训。我尝试制作一个子主题并在functions.php中排列样式。我不知道我做错了什么。请帮助，因为style.css没有加载任何东西。我尝试了导入方式，仍然无法正常工作。

Thanx in adv

functions.php的代码

   <?php
    function avudo_add_styles(){
        wp_enqueue_style ('main_css', get_stylesheet_uri());
    }
    add_action('wp_enqueue_scripts','avudo_add_styles');
    ?>

的style.css

/*
 Theme Name:   Twenty fourteen Child
 Theme URI:    http://example.com/twenty-fifteen-child/
 Description:  Twenty Fifteen Child Theme
 Author:       John Doe
 Author URI:   http://example.com
 Template:     twentyfourteen
 Version:      1.0.0
 License:      GNU General Public License v2 or later
 License URI:  http://www.gnu.org/licenses/gpl-2.0.html
 Tags:         light, dark, two-columns, right-sidebar, responsive-layout, accessibility-ready
 Text Domain:  twenty-fourteen-child
*/

/*testing*/
body{
    background-color: blue;
}