I took on this project for my mom... Trying to build a website for her HOA. I really love the "HOAT" template, but I cannot make the content go full screen. I had deleted the parts I didn't need, but now it just won't go full screen. How can I fix this?

I took on this project for my mom... Trying to build a website for her HOA. I really love the "HOAT" template, but I cannot make the content go full screen. I had deleted the parts I didn't need, but now it just won't go full screen. How can I fix this?