Overlapping Problem. Help please :)

Hello all,

I am building a website using a theme I bought before I knew the developer has been missing for a few months now.

The theme has an area that you can ad ads. Well when I added the code there seems to be an overlapping problem.

Here is a picture: https://imgur.com/E2lDzyT
Or you can go check out: https://funfrivgames.com/fantastic-bird-in-woods-puzzle/

I am ok with code I guess, as I can figures tuff out 9/10 times by looking at the page source. But I have been trying to figure this out for some time.

If anyone can fix it I will forever be in your debt.
So basically fix it for me and I will offer you my firstborn!

-Zack