HTML Code

<!DOCTYPE html>
<html>
<head>
  <title>CSS max-width 600px</title>
  <style>
    body { font-family: sans-serif; padding: 1.5rem; background: #f8fafc; }
    .container {
      max-width: 600px;
      margin: 0 auto;
      padding: 20px;
      background-color: #f0f0f0;
      border-radius: 0.75rem;
    }
  </style>
</head>
<body>
  <h1>Container with Max Width</h1>
  <div class="container">
    <p>This container will not exceed 600 pixels in width, regardless of the viewport size.</p>
  </div>
</body>
</html>

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CSS max-width Property - 600px Centered Container