HTML Code

<!DOCTYPE html>
<html>
<head>
  <title>CSS max-inline-size 80vw</title>
  <style>
    body {
      font-family: sans-serif;
      padding: 1.5rem;
      background: #f8fafc;
      margin: 0;
    }
    .card {
      max-inline-size: 80vw;
      margin-inline: auto;
      padding: 1.5rem;
      background: #fef3c7;
      border: 1px solid #fcd34d;
      border-radius: 0.75rem;
    }
  </style>
</head>
<body>
  <h1>Viewport Cap: 80vw</h1>
  <div class="card">
    <p>This card never grows wider than 80% of the viewport width.</p>
    <p>Resize the browser window to see the cap change with viewport size.</p>
  </div>
</body>
</html>

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CSS max-inline-size Property - 80vw Viewport Cap