HTML Code

<!DOCTYPE html>
<html>
<head>
  <title>CSS aspect-ratio Example</title>
  <style>
    .video-container {
      width: 100%;
      max-width: 640px;
      aspect-ratio: 16 / 9;
      background: linear-gradient(135deg, #2563eb, #1d4ed8);
      border-radius: 0.75rem;
      display: grid;
      place-items: center;
      color: #fff;
      font-family: sans-serif;
    }
  </style>
</head>
<body>
  <h1>Div with 16:9 Aspect Ratio</h1>
  <div class="video-container">
    Video or iframe goes here
  </div>
</body>
</html>

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CSS aspect-ratio Property - 16:9 Video Container