/**
 * Premierk Theme functions and definitions
 *
 * @link https://developer.wordpress.org/themes/basics/theme-functions/
 *
 * @package Premierk
 * @since 1.0.0
 */

/**
 * Define Constants
 */
define( 'CHILD_THEME_PREMIERK_VERSION', '1.0.0' );

/**
 * Enqueue styles
 */
function child_enqueue_styles() {

        wp_enqueue_style( 'premierk-theme-css', get_stylesheet_directory_uri() . '/style.css', array('astra-theme-css'), CHILD_THEME_PREMIERK_VERSION, 'all' );

}

add_action( 'wp_enqueue_scripts', 'child_enqueue_styles', 15 );
<?xml version="1.0" encoding="UTF-8"?>
<?xml-stylesheet type="text/xsl" href="https://premierkenya.co.ke/wp-sitemap-index.xsl" ?>
<sitemapindex xmlns="http://www.sitemaps.org/schemas/sitemap/0.9"><sitemap><loc>https://premierkenya.co.ke/wp-sitemap-posts-post-1.xml</loc></sitemap><sitemap><loc>https://premierkenya.co.ke/wp-sitemap-posts-page-1.xml</loc></sitemap><sitemap><loc>https://premierkenya.co.ke/wp-sitemap-taxonomies-category-1.xml</loc></sitemap><sitemap><loc>https://premierkenya.co.ke/wp-sitemap-users-1.xml</loc></sitemap></sitemapindex>