app.js

const hamburger = document.querySelector('.header .nav-bar .nav-list .hamburger');
const mobile_menu = document.querySelector('.header .nav-bar .nav-list ul');
const menu_item = document.querySelectorAll('.header .nav-bar .nav-list ul li a');
const header = document.querySelector('.header.container');
hamburger.addEventListener('click', () => {
	hamburger.classList.toggle('active');
	mobile_menu.classList.toggle('active');});
document.addEventListener('scroll', () => {
	var scroll_position = window.scrollY;if (scroll_position > 250) {header.style.backgroundColor = '#29323c';} else {header.style.backgroundColor = 'transparent';}});
menu_item.forEach((item) => {item.addEventListener('click', () => {hamburger.classList.toggle('active'); mobile_menu.classList.toggle('active');});});