main.js

// Setup End Date for Countdown (getTime == Time in Milleseconds)
let launchDate = new Date("Nov 09, 2021 00:00:00").getTime();

// Setup Timer to tick every 1 second
let timer = setInterval(tick, 1000);

function tick () {
  // Get current time
  let now = new Date().getTime();
  // Get the difference in time to get time left until reaches 0
  let t = launchDate - now;

  // Check if time is above 0
  if (t > 0) {
    // Setup Days, hours, seconds and minutes
    // Algorithm to calculate days...
    let days = Math.floor(t / (1000 * 60 * 60 * 24));
    // prefix any number below 10 with a "0" E.g. 1 = 01
    if (days < 10) { days = "0" + days; }
    
    // Algorithm to calculate hours
    let hours = Math.floor((t % (1000 * 60 * 60 * 24)) / (1000 * 60 * 60));
    if (hours < 10) { hours = "0" + hours; }

    // Algorithm to calculate minutes
    let mins = Math.floor((t % (1000 * 60 * 60)) / (1000 * 60));
    if (mins < 10) { mins = "0" + mins; }

    // Algorithm to calc seconds
    let secs = Math.floor((t % (1000 * 60)) / 1000);
    if (secs < 10) { secs = "0" + secs; }

    // Create Time String
    let time = `${days} : ${hours} : ${mins} : ${secs}`;

    // Set time on document
    document.querySelector('.countdown').innerText = time;
  }
}

    //Accordion
    document.addEventListener("DOMContentLoaded", function(event) { 


      var acc = document.getElementsByClassName("accordion");
      var panel = document.getElementsByClassName('panel');
      
      for (var i = 0; i < acc.length; i++) {
          acc[i].onclick = function() {
              var setClasses = !this.classList.contains('active');
              setClass(acc, 'active', 'remove');
              setClass(panel, 'show', 'remove');
      
              if (setClasses) {
                  this.classList.toggle("active");
                  this.nextElementSibling.classList.toggle("show");
              }
          }
      }
      
      function setClass(els, className, fnName) {
          for (var i = 0; i < els.length; i++) {
              els[i].classList[fnName](className);
          }
      }
      
      });

    // Nav button hide     
    var links = document.querySelectorAll('.nav-links');
    var linksLength = links.length
    
    for(var i = 0; i < linksLength; i++) {
      links[i].addEventListener('click', function() {
        document.getElementById('check').checked = false;
      });
    }

    var links1 = document.querySelectorAll('.logo-container');
    var linksLength1 = links1.length
    
    for(var j = 0; j < linksLength1; j++) {
      links1[j].addEventListener('click', function() {
        document.getElementById('check').checked = false;
      });
    }