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 top absolute</title>
  <style>
    .parent {
      position: relative;
    }

    .box {
      position: absolute;
      top: 20px;
    }
  </style>
</head>
<body>
  <div class="parent">
    <div class="box">Box</div>
  </div>
</body>
</html>

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CSS top Property - absolute 20px