how to adjust table column width in html code example

Example: html table set column width

<table style="width: 100%"> <!-- Use The Width Property -->
    <tbody>
        <tr>
            <td style="background-color: #777">15%</td>
            <td style="background-color: #aaa">70%</td>
            <td style="background-color: #777">15%</td>
        </tr>
    </tbody>
</table>