HTML Code

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

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

    section {
      display: inline-block;
      padding: 16px;
      border: 1px solid #ccc;
      perspective: 400px;
    }

    .card {
      position: relative;
      width: 140px;
      height: 90px;
      transform-style: preserve-3d;
      transform: rotateY(180deg);
    }

    .card div {
      position: absolute;
      inset: 0;
      text-align: center;
      line-height: 90px;
      color: #fff;
      backface-visibility: hidden;
    }

    .front {
      background: #1d4ed8;
    }

    .back {
      background: #0f766e;
      transform: rotateY(180deg);
    }
  </style>
</head>
<body>
  <p>The card is already turned. You read <strong>Back</strong>, because both faces use <strong>backface-visibility: hidden</strong> and the card uses <strong>preserve-3d</strong>.</p>
  <section>
    <div class="card">
      <div class="front">Front</div>
      <div class="back">Back</div>
    </div>
  </section>
</body>
</html>

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CSS backface-visibility Property — two faces