https://www.dunemovie.com/insider/js/main.js

1$(document).ready(function () {
2
3  if (navigator.userAgent.match(/Trident\/7\./)) {
4    $('body').addClass('ie');
5    $('<link>')
6      .appendTo('head')
7      .attr({
8        type: 'text/css',
9        rel: 'stylesheet',
10        href: 'css/ieOld_style.css'
11      });
12
13    console.clear();
14  }
15
16  $(window).on('scroll', function () {
17    // Get the current vertical scroll position
18    var scrollPosition = $(this).scrollTop();
19
20    // Check if the scroll position is greater than 300px
21    if (scrollPosition > 300) {
22      $('.down_arrow_wrapper').fadeOut(); // Hides the element smoothly
23    } else {
24      $('.down_arrow_wrapper').fadeIn(); // Shows the element again when scrolling up
25    }
26  });
27    
28    $('.down_arrow_wrapper').on('click', function (e) {
29   e.preventDefault();
30   var target = $(this).attr("href");
31   $("html, body").animate({
32     scrollTop: $(target).offset().top
33   }, 1000);
34 });
35});