remove padding in individual post

I’d like to remove the padding in an individual post. Basically I want to place an add in the small blog format front page, but it has a lot of white space around it and I’d like it to be tight.

Also, my psychotropic question has not been answered and its been about a week https://hb-themes.com/forum/all/topic/header-full-length-and-width/

Hoping to get an answer there soon.

Thank you for your help.