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 bottom Percentage Example</title>
  <style>
    body {
      font-family: sans-serif;
      padding: 1.5rem;
      background: #f8fafc;
    }

    .container {
      position: relative;
      height: 200px;
      max-width: 20rem;
      border: 1px solid #64748b;
    }

    .box {
      position: absolute;
      bottom: 10%;
      left: 10%;
      width: 80px;
      height: 80px;
      background: #16a34a;
    }
  </style>
</head>
<body>
  <h1>bottom: 10% in a Container</h1>
  <div class="container">
    <div class="box"></div>
  </div>
</body>
</html>

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CSS bottom Property - Percentage Offset