HTML Code

<!DOCTYPE html>

<html lang=en>

<head>

  <meta charset=UTF-8>

  <meta name=viewport content="width=device-width,initial-scale=1">

  <title>CSS margin auto Center</title>

  <style>body{font-family:system-ui,sans-serif;margin:0;padding:1.5rem;background:#f8fafc;color:#334155}h1{margin:0 0 .75rem;font-size:1.25rem;color:#0f172a}p{margin:0 0 1rem;font-size:.95rem}.centered-box{width:240px;margin:0 auto;padding:1rem;background:#dbeafe;border:1px solid #93c5fd;border-radius:8px;text-align:center;color:#1e3a8a}</style>

</head>

<body>

  <h1>CSS margin: 0 auto</h1>

  <p>This block box is centered horizontally:</p>

  <div class=centered-box>

    <strong>Centered Container</strong>

  </div>

</body>

</html>

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Modern Replacement — margin: 0 auto