Tables have no base styling (apart from the browser defaults). Use the mzp-u-data-table class to display tabular data with a bit more polish.

<table class="mzp-u-data-table">
  <caption>Table caption</caption>
  <thead>
    <tr>
      <td></td>
      <th scope="col">Column</th>
      <th scope="col">Column</th>
      <th scope="col">Column</th>
    </tr>
  </thead>
  <tbody>
    <tr>
      <th scope="row">Row</th>
      <td>Cell</td>
      <td>Cell</td>
      <td>Cell</td>
    </tr>
    <tr>
      <th scope="row">Row</th>
      <td>Cell</td>
      <td>Cell</td>
      <td>Cell</td>
    </tr>
  </tbody>
</table>