Дочерняя тема. Подключение стилей в дочерней теме.

functions.php

<?php

add_action( 'wp_enqueue_scripts', 'enqueue_parent_styles' );
    
function enqueue_parent_styles() {
   wp_enqueue_style( 'parent-style', get_template_directory_uri().'/style.css' );
}

?>

style.css

/*
 Theme Name: Twenty Nineteen Me
 Theme URL: https://maksimerohin.ru
 Description: Twenty Nineteen Child Theme
 Author: Maksim Erokhin
 Author URL: https://maksimerohin.ru
 Template: twentynineteen
 Version: 1.1
 Text Domain: twentynineteen-me
 */