HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <title>Internal CSS Example</title>
  <style>
    body {
      margin: 0;
      padding: 1.5rem;
      font-family: system-ui, sans-serif;
      background: #f8fafc;
    }

    h1 {
      color: #1e293b;
      font-size: 1.125rem;
    }

    p {
      color: #dc2626;
      font-size: 1rem;
    }
  </style>
</head>
<body>
  <h1>Internal CSS</h1>
  <p>All paragraphs are red — styled from the &lt;style&gt; block in &lt;head&gt;.</p>
</body>
</html>

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Internal CSS — &lt;style&gt; in &lt;head&gt;

Internal CSS — <style> in <head>