Spacing in and around ad box

Hi Guys,
I have installed the InPostAds plugin and it works fine;
Minor glitch:
1. There is a blank space left within the ad box on the bottom; and,
2. Although it automatically adds a break between existing post text on the top, it doesn't do the same at the bottom.
I would like there to be no space on the bottom of the box - it is evenly spaced all around otherwise, and I would prefer a break between the bottom of the box and the continuation of the post text.
Could you please advise...
Btw - I'm not a developer - I have just enough knowledge of WP / HTML etc to be dangerous :wink:
Many Thanks
Harry