text: const up = document.querySelector("#up");
  const navbar = document.querySelector("#navbar");
  
  up.addEventListener("click", function() {
    window.scrollTo(0, 0)
  })
  window.onscroll = function() {
    if (window.scrollY > 420) {
      up.style.display = "block"
    } else {
      up.style.display = "none"
    }
  }