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 perspective Length</title>
  <style>
    section {
      perspective: 500px;
    }

    div {
      width: 120px;
      height: 80px;
      background: #1d4ed8;
      color: #fff;
      text-align: center;
      line-height: 80px;
      transform: rotateY(45deg);
    }
  </style>
</head>
<body>
  <section>
    <div>Card</div>
  </section>
</body>
</html>

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CSS perspective Property - Length on Parent