ener("scroll", () => {
      if (window.scrollY > 100) {
        bottomToTopButton.style.display = "block";

        if (
          window.scrollY + window.innerHeight >=
          document.documentElement.scrollHeight - 10
        ) {
          icon.classList.remove("fa-arrow-down");
          icon.classList.add("fa-arrow-up");
        } else {
          icon.classList.remove("fa-arrow-up");
          icon.classList.add("fa-arrow-down");
        }
      } else {
        bottomToTopButton.style.display = "n