Make the page wider

I’m using the Vantage theme. If I, in Theme Settings, choose Full Width instead of Boxed, the content of the page is still displayed in the same position (only the “background” etc. uses the full width), meaning there’s a lot of unused space both to the left and right, especially on a wide display.

I’ve eg chosen to display the logo in the menu, and in Boxed it’s displayed in the top left corner of the box, but when I choose Full Width it ends up as close to the middle as to the left corner, looking quite silly.

I’d like the “content area” in Full Width to use a bigger percentage of the available screen width, instead of having so much unused space to the left and right of it. I would be very grateful if someone could help me accomplish that, as I’ve tried and failed for days now (I’m quite new to both wordpress and css).

***SOLVED***

Solution was to add the following to custom css.

body.responsive.layout-full #page-wrapper .full-container {
max-width: 100%;
}