assets/js/main.js


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(function () {
  const backToTopBtn = document.getElementById("back_to_top");

  window.onscroll = function () {
    scrollFunction(backToTopBtn);
  };

  backToTopBtn.addEventListener("click", backToTop);
})();

function scrollFunction(btn) {
  const pageOffset =
    document.documentElement.scrollTop || document.body.scrollTop;
  if (btn) btn.style.visibility = pageOffset > 450 ? "visible" : "hidden";
}

// When the user clicks on the button, scroll to the top of the document
function backToTop(e) {
  e.preventDefault();
  document.body.scrollTop = 0; // For Safari
  document.documentElement.scrollTop = 0; // For Chrome, Firefox, IE and Opera
}