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 left Percentage Example</title>
  <style>
    body {
      font-family: system-ui, sans-serif;
      padding: 1.5rem;
      line-height: 1.6;
    }

    .container {
      position: relative;
      width: 280px;
      height: 120px;
      background-color: #f1f5f9;
      border: 2px dashed #94a3b8;
      border-radius: 0.35rem;
    }

    .marker {
      position: absolute;
      left: 50%;
      transform: translateX(-50%);
      top: 2.5rem;
      padding: 0.5rem 0.85rem;
      background-color: #2563eb;
      color: #fff;
      font-weight: 600;
      border-radius: 0.35rem;
    }
  </style>
</head>
<body>
  <h1>Percentage-Based left</h1>
  <div class="container">
    <div class="marker">Centered</div>
  </div>
</body>
</html>

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CSS left Property - percentage offset