HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>CSS margin auto Example</title>
  <style>
    body {
      font-family: system-ui, sans-serif;
      padding: 1.5rem;
      line-height: 1.6;
      background: #f8fafc;
    }

    .panel {
      width: 16rem;
      margin: 0 auto;
      padding: 1rem;
      background: #dbeafe;
      border-radius: 0.5rem;
      text-align: center;
      color: #1e3a8a;
      font-weight: 600;
    }
  </style>
</head>
<body>
  <h1>Centered Panel</h1>
  <div class="panel">margin: 0 auto</div>
</body>
</html>

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CSS margin Property - center with auto