In HTML body try:
<table>
<tr>
<td>
<div style="word-wrap: break-word; width: 800px">
Hello world, how are you? More text here to see if it wraps after a long while of writing and it does on Firefox but I have not tested it on Chrome yet. It also works wonders if you have a medium to long paragraph. Just avoid writing in the CSS file that the words have to break-all, that's a small tip.
</div>
</td>
</tr>
</table>
In CSS body try:
background-size: auto;
table-layout: fixed;