Decrease Page Width "SKT Full Width" WordPress Theme

Hi,

I am having a hard time finding where to adjust the width of all my pages “except the home page”.

Here is my site: http://jaygilsphotography.com

You can see a lot of empty space on the right hand side, this is what I would like to remove, so my pictures or information fill up the page and everything looks more centered and easier on the eyes.

Thank you,
Jay Gil