// Show button after scrolling down
window.onscroll = function() {scrollFunction()};

function scrollFunction() {
  const btn = document.getElementById("backToTopBtn");
  if (document.body.scrollTop > 300 || document.documentElement.scrollTop > 300) {
    btn.style.display = "block";
  } else {
    btn.style.display = "none";
  }
}

function topFunction() {
  window.scrollTo({ top: 0, behavior: 'smooth' });
  document.getElementById("backToTopBtn").style.display = "none";
}