DocRaptor supports many CSS style attributes you're already familiar with, plus a few Excel file specific attributes. A complete list of supported attributes is available here. Apply these attributes through inline CSS styles, like this:

<table name="Example Worksheet">
  <tr style="font-size: 16px">
    <td colspan="2">Big Row</td>
  </tr>
  <tr>
    <td style="color: blue">Blue Cell</td>
    <td style="-xls-format:currency_dollar">1000</td>
  </tr>
</table>

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