HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <title>margin-right: auto</title>
  <style>
    body {
      font-family: Arial, sans-serif;
      margin: 16px;
      color: #0f172a;
    }

    p {
      margin: 0 0 12px;
      max-width: 40rem;
      line-height: 1.5;
    }

    .wrap {
      width: 220px;
      border: 1px dashed #94a3b8;
      padding: 8px;
    }

    .box {
      width: 80px;
      margin-right: auto;
      padding: 10px;
      border: 2px solid #f59e0b;
      background: #fef3c7;
      box-sizing: border-box;
      text-align: center;
    }
  </style>
</head>
<body>
  <p><strong>margin-right: auto</strong> absorbs leftover space on the right, so the box stays on the left.</p>
  <div class="wrap">
    <div class="box">Left</div>
  </div>
</body>
</html>

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CSS margin-right Property — auto