<?php

add_action( 'wp_enqueue_scripts', 'my_theme_enqueue_styles' );

function my_theme_enqueue_styles() {

    $parent_style = 'twentynineteen-style';

    wp_enqueue_style( $parent_style, get_template_directory_uri() . '/style.css' );

    wp_enqueue_style( 'twentynineteen-child-style',

        get_stylesheet_directory_uri() . '/style.css',

        array( $parent_style ),

        wp_get_theme()->get('Version')

    );

}