functions.php

<?php
/**
 * Load the style sheet from the parent theme.
 *
 */
function theme_name_parent_styles() {

	// Enqueue the parent stylesheet
	wp_enqueue_style( 'theme-name-parent-style', get_template_directory_uri() . '/style.css', array(), '0.1', 'all' );

	// Enqueue the parent rtl stylesheet
	if ( is_rtl() ) {
		wp_enqueue_style( 'theme-name-parent-style-rtl', get_template_directory_uri() . '/rtl.css', array(), '0.1', 'all' );
	}

}
add_action( 'wp_enqueue_scripts', 'theme_name_parent_styles' );
?>