HTML Code

<!DOCTYPE html>
<html>
<head>
  <title>CSS video:fullscreen Example</title>
  <style>
    body {
      font-family: system-ui, sans-serif;
      padding: 1.5rem;
      background: #f8fafc;
    }

    video {
      width: 100%;
      max-width: 480px;
      border-radius: 0.5rem;
      display: block;
    }

    video:fullscreen {
      max-width: none;
      width: 100vw;
      height: 100vh;
      object-fit: contain;
      background: #000;
      border-radius: 0;
    }

    p {
      margin-top: 0.75rem;
      font-size: 0.875rem;
      color: #64748b;
    }
  </style>
</head>
<body>
  <video controls>
    <source src="https://interactive-examples.mdn.mozilla.net/media/cc0-videos/flower.mp4" type="video/mp4">
    Your browser does not support the video tag.
  </video>
  <p>Use the video's native fullscreen button to see video:fullscreen styles.</p>
</body>
</html>

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CSS :fullscreen Selector - Video Player