HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>headings and class</title>
  <style>
    body { font-family: sans-serif; padding: 16px; max-width: 36rem; }
  </style>
</head>
<body>
  <h1>Main Title</h1>
  <p class="subtitle">A subtitle paragraph</p>
  <h2>Section</h2>
  <p>Regular paragraph</p>
  <script src="https://code.jquery.com/jquery-3.7.1.min.js"></script>
  <script>
    $("h1, h2, .subtitle").css({ color: "#2563eb", fontWeight: "bold" });
  </script>
</body>
</html>

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h1, h2, .subtitle styling (Try It)