window.addEventListener('scroll', function () {
  const navbar = document.querySelector('.navbar');
  const mobile_navbar = document.querySelector('.mobile-navbar');
  if (window.scrollY > 10) {
    navbar.classList.add('scrolled');
    mobile_navbar.classList.add('scrolled');
  } else {
    navbar.classList.remove('scrolled');
    mobile_navbar.classList.remove('scrolled');
  }
});