Remove Site Wrap

Hello. I downloaded the free version of this theme and am trying to decide if the free or paid version will work for a client project. So far the free theme has been great, but I am wondering if either version has a way to remove the site wrapper, or make the website widescreen landscape format.

Also is there a way to make all three feature content boxes a different color for each? I was able to change the first box, but the last two I do not know the correct CSS to change.

I don’t have my testing site live yet to provide a link. Any help is much appreciated!