Style.css and bootstrap CDN not loading in function.php

<?php 

function load_css(){
    
    wp_enqueue_style('load_css', get_theme_file_uri('/style.css'));
    wp_enqueue_style('bootstrap-cdn-css', 'https://cdn.jsdelivr.net/npm/bootstrap@5.0.2/dist/css/bootstrap.min.css');
    wp_enqueue_script('bootstrap-cdn-js', 'https://cdn.jsdelivr.net/npm/bootstrap@5.0.2/dist/js/bootstrap.min.js', 'jquery', false, true);

    // wp_enqueue_style( 'parent-style', get_template_directory_uri() . '/style.css' );
    // wp_enqueue_style( 'child-style', get_stylesheet_directory_uri() . '/style.css', array('parent-style') ); 
   
}


add_action('wp_enqueue_scripts', 'load_css');

In style.css, I have given body { color: orange; } it is not showing me orange color for heading in index.php, it means style.css not loaded correctly. and I want to load boostrap.js file for footer and style.css must work correctly. Could somebody help me to solve the error?