WordPress CSS 2

wordpress-css-2.php

<?php
function global_css() {
 
 wp_register_style( 'parent_main', get_template_directory_uri() . '/css/main.css' , filemtime( get_template_directory() . '/css/main.css' ), null, 'screen' );
 wp_register_style( 'child_main', get_stylesheet_directory_uri() . '/style.css' , filemtime( get_stylesheet_directory() . '/style.css' ), null, 'screen' );
 
 if ( ! is_admin() ) :
 wp_enqueue_style( 'parent_main' );
 endif;
 
 wp_enqueue_style( 'child_main' );
 }
 
add_action( 'wp_print_styles', 'global_css' );