changing page width

Hi Im using the old Twenty Fourteen template,. and before I managed to find the css thingy that would change the post and page content from being a tiny thin column, and fill the available area.

After an update (where I forgot to keep a copy of my altered css) I cannot now find that css line.

So, the question is, How do I change the width of a page/post in Twenty Fourteen?

Thanks

• This topic was modified 9 years, 4 months ago by mark francombe.