index.html

<!DOCTYPE html>
<html>
  <head>
    <meta charset="utf-8" />
    <meta http-equiv="X-UA-Compatible" content="IE=edge" />
    <title>Background Focus Effect</title>
    <meta name="viewport" content="width=device-width, initial-scale=1" />
    <link rel="stylesheet" type="text/css" media="screen" href="style.css" />
  </head>

  <body>
    <div class="bg"></div>
    <div class="bg_mask"></div>
    <main>
      <h1>Focus</h1>
    </main>

    <script>
      "use strict";
      console.clear();

      var root = document.querySelector(":root");
      function spotlight(e) {
        root.style.setProperty("--x", e.pageX + "px");
        root.style.setProperty("--y", e.pageY + "px");
      }
      window.addEventListener("pointermove", spotlight);
      window.addEventListener("pointerdown", spotlight);
    </script>
  </body>
</html>
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