Help Fix Theme

OK I build websites for a living.
I had a very nice young man call me and ask if i could build him a website
he said that he tried with word press but just could not figure it out
I said that I would try to help him, no charge.
All he asked for was could I add adsence to the top 728×90 and footer 720×90 and maybe a small one on the right.
I added a 728×90 at the top but it keeps shrinking to about half.
scroll bar in the footer that goes up and down when an ad is added I think if I fix this for him he can handle the rest.
Here is the link https://liftingdigest.com/
Well I hope we can help this young man.