Edit width of the topic/last post Ad box

[postcd]

Hello,

vBulletin has an Advertisement manager and we can add an Ad into each topic into last post in the thread view.

I mean last post in each thread contains some Ad.

I added an Text with hyperlink

Bad result: the last post text got srinked into like 10px wide contianer and the Ad text occupy around 90% of the last post width.

Please in which file i can define maximum width of the Ad container or what to do to prevent tis issue? Thank you