HTML Code

<!DOCTYPE html>
<html lang=en>
<head>
  <meta charset=UTF-8>
  <meta name=viewport content="width=device-width,initial-scale=1">
  <title>Nested Directory List</title>
  <style>body{font-family:system-ui,sans-serif;margin:0;padding:1.5rem;background:#f8fafc;color:#334155;line-height:1.7}h1{margin:0 0 1rem;font-size:1.25rem;color:#0f172a}ul{margin:0;padding-left:1.5rem;max-width:300px}li{margin:.25rem 0;color:#475569}.folder{font-weight:600;color:#1e40af}</style>
</head>
<body>
  <h1>Nested folder list</h1>
  <ul>
    <li>File 1</li>
    <li>File 2</li>
    <li class=folder>Folder 1
      <ul>
        <li>Subfile 1</li>
        <li>Subfile 2</li>
      </ul>
    </li>
  </ul>
</body>
</html>

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Nested ul for Folder Structure