Make Water Lily full width

Hello,

I am wondering if there is a way to make Water Lily theme full width?

I am using this theme a bit differently than it is supposed to be used I guess.

What I would love to do is to make it’s post area wider so I could have larger masonry type galleries inside the posts. It would be perfect if there was a way to make the menu appear on the side of the browser view and the rest available space would be used for showing the post. Would that be possible?

Currently it is all pretty much centered, would be awesome if we could align it to the left and use the entire space on the right for showcasing content. Like instead of seeing 3 columns of featured posts there could be 5 columns of masonry view and once you click on a post, you would be presented with a large area of content.

Thank you very much for your advice.