Well the usual way would be to add an overflow:scroll; CSS rule to the element – so that would be my first try at this. The worry is that it might have unwanted knock-on effects on other posts but I would still do it first to see. There may be other ways around it. So try this…

Forum admin > Themes > Custom CSS.

Add the following rule:

#spMainContainer .spTopicPostSection .spPostSection .spPostContentSection .spPostContent {
         overflow: scroll;
}

save it – clear your browser cache and see if that helps,

It works! Thank you very much.

So far so good. I hope there won’t be any unwanted effect.

It really depends on whether you need to do this often or if this is basically a one-off. If a one-off then it would be better to be explicit in the CSS to ensure it only effects that one post. If often or regular then you may need to leave it as it is and accept there may just be the odd post that overflows.

While I am afraid to day I do not recall any names, I have seen table plugins that work ‘responsively’ when displayed on a mobile but this will often mean stacking table cells on top of each other. Might be worth investigating however.