Back to Top JS

document.addEventListener("DOMContentLoaded", function() {

    var btn = document.getElementById("back-to-top");

    window.addEventListener("scroll", function() {

        if (window.scrollY > 300) {

            btn.style.display = "block";

        } else {

            btn.style.display = "none";

        }

    });

    btn.addEventListener("click", function(e) {

        e.preventDefault();

        window.scrollTo({ top: 0, behavior: "smooth" });

    });

});