seconds-countdown.html

<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <title>Countdown Clock</title>
    <link rel="stylesheet" href="css/global.css" />
    <link rel="stylesheet" href="https://use.typekit.net/qro8nwd.css" />
    <script src="js/webcg-framework.umd.js"></script>
    <script type="text/javascript" src="js/seconds-countdown.js"></script>
    <style>
      .overlay {
        /* Initially hide the overlay */
        width: auto;
        opacity: 0;
        position: absolute;
        transform: translate(-50%,-50%);
        left: 50%;
        top: 50%;
        transition: opacity 0.5s;
      }
    </style>
  </head>
  <body>
    <div class="overlay">
      <div
        class="line f0 countdown"
        style="width: 100%; font-size: 10vh; text-align: center; color: white;"
      ></div>
    </div>
  </body>
</html>