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>