script.js

/*JS for Toggle Menu For small screens*/
var navLinks = document.getElementById("navLinks");
function showMenu() {
    navLinks.style.right = "0";
}
function hideMenu() {
    navLinks.style.right = "-200px";
}
//Get the button
var mybutton = document.getElementById("myBtn");

/* When the user scrolls down 200px from the top of the document, show the button */
window.onscroll = function () { scrollFunction() };

function scrollFunction() {
    if (document.body.scrollTop > 200 || document.documentElement.scrollTop > 200) {
        mybutton.style.display = "block";
    } else {
        mybutton.style.display = "none";
    }
}

// When the user clicks on the button, scroll to the top of the document
function topFunction() {
    document.body.scrollTop = 0;
    document.documentElement.scrollTop = 0;
}