HTML Code

<!DOCTYPE html>
<html>
<head>
  <title>CSS max-width 90%</title>
  <style>
    body { font-family: sans-serif; padding: 1.5rem; background: #f8fafc; }
    .container {
      max-width: 90%;
      margin: 0 auto;
      padding: 20px;
      background-color: #e0e0e0;
      border-radius: 0.75rem;
    }
  </style>
</head>
<body>
  <h1>Responsive Container</h1>
  <div class="container">
    <p>This container's maximum width is 90% of its parent element's width, making it responsive to different screen sizes.</p>
  </div>
</body>
</html>

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CSS max-width Property - 90% Responsive Container