main.js

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window.onscroll = function () {
  myFunction();
};

function myFunction() {
  var winScroll = document.body.scrollTop || document.documentElement.scrollTop;
  var height =
    document.documentElement.scrollHeight -
    document.documentElement.clientHeight;
  var scrolled = (winScroll / height) * 100;
  document.getElementById("myBar").style.width = scrolled + "%";
}

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var actualYear = new Date().getFullYear();

var actualYearSpan = document.querySelector(".actual-year");

actualYearSpan.innerText = actualYear;