[css] table/ fixed cell width

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Hi everyone!
I'm newbie in css and I have a little problem. I have to change some
style properties on the table (I can't interfere with html, it should by
done by css only):

<td colspan="2">aa</td>

I would like to fix width of the cell '11'. In case of adding to cell
'aa' content (img for ecample) wider than the whole table, only cell
'aa' and cell '22' should boost their width. The '11' cell should keep
their declarated width regardless of table width.
What is the best way to do that?

Thanks in advance,

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