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<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>CSS border-top-width Example</title>
  <style>
    body {
      font-family: sans-serif;
      padding: 1.5rem;
      background: #f8fafc;
    }

    p.thin-border {
      max-width: 22rem;
      border-top-width: thin;
      border-top-style: solid;
      border-top-color: black;
      padding-top: 0.75rem;
      margin-bottom: 0.75rem;
    }

    p.thick-border {
      max-width: 22rem;
      border-top-width: thick;
      border-top-style: solid;
      border-top-color: black;
      padding-top: 0.75rem;
    }
  </style>
</head>
<body>
  <h1>Border Top Width Example</h1>
  <p class="thin-border">This paragraph has a thin top border.</p>
  <p class="thick-border">This paragraph has a thick top border.</p>
</body>
</html>

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CSS border-top-width Property - Border Top Width Example