Moesia Page Size

Hi,

I’m trying to make the page size wider on desktop screens. The area in the red dotted line I want to extend closer to the blue solid line.

Also looking to get rid of the border (red dotted lines) so it blends into the white background color. I would also like to apply this to the top menu bar (in orange).

I have a little coding experience but not with CSS or HTML so I don’t know what I’m looking to change.
Made a mock up in Photoshop for what I’m going for.
what I want to change

current page. http://www.evaning.com

Thanks for the help!
Evan