How to create a "coming soon page" with CSS and JavaScript?

CSS Web Development Front End Technology

To create a coming soon page with CSS and JavaScript, the code is as follows −

Example

<!DOCTYPE html>
<html>
<style>
   body {
      height: 100vh;
      font-family: "Segoe UI", Tahoma, Geneva, Verdana, sans-serif;
      margin: 0;
   }
   .timer {
      text-align: center;
      font-size: 60px;
      margin-top: 0px;
      color: white;
   }
   .bgimg {
      background-image: url("https://i.picsum.photos/id/829/800/800.jpg");
      height: 100%;
      background-position: center;
      background-size: cover;
      position: relative;
      color: white;
      font-size: 25px;
   }
   .middle {
      position: absolute;
      top: 50%;
      left: 50%;
      transform: translate(-50%, -50%);
      text-align: center;
   }
   hr {
      margin: auto;
      width: 40%;
   }
</style>
<body>
<div class="bgimg">
<div class="middle">
<h1>COMING SOON</h1>
<hr />
<h2 class="timer"></h2>
</div>
</div>
<script>
   var countDownDate = new Date("June 5, 2022 11:27:15").getTime();
   var timeClear = setInterval(function() {
      var now = new Date().getTime();
      var timeLeft = countDownDate - now;
      var days = Math.floor(timeLeft / (1000 * 60 * 60 * 24));
      var hours = Math.floor(
         (timeLeft % (1000 * 60 * 60 * 24)) / (1000 * 60 * 60)
      );
      var minutes = Math.floor((timeLeft % (1000 * 60 * 60)) / (1000 * 60));
      var seconds = Math.floor((timeLeft % (1000 * 60)) / 1000);
      document.querySelector(".timer").innerHTML = days + "d " + hours + "h " + minutes + "m " + seconds + "s ";
      if (timeLeft < 0) {
         clearInterval(timeClear);
         document.querySelector(".timer").innerHTML = "Timer Finished";
      }
   }, 1000);
</script>
</body>
</html>