<!DOCTYPE html>
<html lang="ja">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>My Tailwind CSS</title>
<script src="https://cdn.tailwindcss.com"></script>
</head>
<body>
<h1 class="text-center text-4xl font-bold text-red-500 opacity-50">Hello</h1>
</body>
</html>