const alertbar = document.querySelector('.alertbar') window.addEventListener('scroll', () => {
if (pageYOffset > 200) { alertbar.style.display = 'block' } else { alertbar.style.display = 'none' }
})
const alertbar = document.querySelector('.alertbar') window.addEventListener('scroll', () => {
if (pageYOffset > 200) { alertbar.style.display = 'block' } else { alertbar.style.display = 'none' }
})