overflow only for smaller viewport

overflow only for smaller viewport

I have a datatable that calculates its width based on its content. I want to apply horizontal scoll when browser windows is too small. I do that by:
style="overflow:scroll;"
However when this windows is bigger than my entire datatable I want to stretch it by streching one column:
<th style="width: 100%;">Title
                                                </th>

It doesnt stretch when I added overflow however. How can I solve that?