HTML Code

<!DOCTYPE html>
<html lang=en>
<head>
  <meta charset=UTF-8>
  <meta name=viewport content="width=device-width,initial-scale=1">
  <title>Basic col Example</title>
  <style>body{font-family:system-ui,sans-serif;margin:0;padding:1.5rem;background:#f8fafc;color:#334155}h1{margin:0 0 .75rem;font-size:1.25rem;color:#0f172a}table{border-collapse:collapse;width:100%;max-width:420px;background:#fff}td,th{border:1px solid #cbd5e1;padding:.5rem .75rem;text-align:left}th{background:#f1f5f9;color:#0f172a}</style>
</head>
<body>
  <h1>colgroup + col</h1>
  <table>
    <colgroup>
      <col span=2 style=background:#f8fafc>
      <col style=background:#eff6ff>
    </colgroup>
    <tr>
      <th>Column 1</th>
      <th>Column 2</th>
      <th>Column 3</th>
    </tr>
    <tr>
      <td>Row 1, Col 1</td>
      <td>Row 1, Col 2</td>
      <td>Row 1, Col 3</td>
    </tr>
    <tr>
      <td>Row 2, Col 1</td>
      <td>Row 2, Col 2</td>
      <td>Row 2, Col 3</td>
    </tr>
  </table>
</body>
</html>

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HTML col Tag — Basic colgroup Structure