Resizing page

[dnet5]

Hi,
First of all, congrats for the theme! Sleek and straight to the point, bringing up the content that we focus on.

I would like to know where I have to edit to expand the currently content page (post page?)

We are developing an intranet based on wordpress using Elucidate in our office; all computers which are going to access it are 1920x1080 resolution and the standard size/width of this column is too small for us. We want to squeeze more content with a wider column.

Saw some line about 680px and 920 on the style.css, but changing it has's changed anything.

This is our currently size; I need to expand it.

Thanks in advance!