Table Cell Resize

HTML

<html>
<body>
    <table cellspacing="0" cellpadding="1" style="border-collapse: collapse;">
        <tbody>
            <tr >
                <td>
                123
                </td>
                <td>123</td>
                <td style="width: 20px">
                    canyouhelpmebreakintolineswith20pxwidth?</td>
            </tr>
            <tr>
                <td>
                abc
                </td>
                <td>
                def
                </td>
                <td>
                </td>
            </tr>
        </tbody>
    </table>
</body>

</html>

CSS

table {border-collapse:collapse; table-layout:fixed; width: 80%}
table td {
  border-width: 1px;
  border:solid 1px; 
  word-wrap:break-word;}