text: 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 = 'rgba(40, 41, 40, 0.671)';
  	}
  });
  
  menu_item.forEach((item) => {
  	item.addEventListener('click', () => {
  		hamburger.classList.toggle('active');
  		mobile_menu.classList.toggle('active');
  	});
  });
  