<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>JavaScript</title>
  <script>
    function initiate() {
      const element = document.getElementById("subtitle");
      element.style.width = "300px";
      element.style.border = "1px solid #FF0000";
      element.style.padding = "20px";
    }
  </script>
</head>
<body onload="initiate()">
  <section>
    <h1>Website</h1>
    <p id="subtitle">The best website ever!</p>
  </section>
</body>
</html>