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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-width Keywords Example</title>
  <style>
    body {
      font-family: sans-serif;
      padding: 1.5rem;
      background: #f8fafc;
    }

    .width-examples div {
      max-width: 16rem;
      border-style: solid;
      border-color: black;
      padding: 0.75rem;
      margin-bottom: 0.75rem;
    }

    .thin { border-width: thin; }
    .medium { border-width: medium; }
    .thick { border-width: thick; }
  </style>
</head>
<body>
  <h1>Border Width Keywords</h1>
  <div class="width-examples">
    <div class="thin">thin border</div>
    <div class="medium">medium border</div>
    <div class="thick">thick border</div>
  </div>
</body>
</html>

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CSS border-width Property - thin medium thick Keywords