Board Thread:Support Requests - Designing Your Wikia/@comment-35301431-20140619173332/@comment-856287-20140619212325

I would advise against trying to set the content width for all visitors based on your own preferences and on your own display; on my monitor it would still be quite wide even if the right margin was the same as the left: http://cl.ly/WATk …and for people with smaller displays (like little netbooks or tablets), things start to get very cramped: http://cl.ly/WBNW

Just let people resize their windows based on their preferences.

Still, you can achieve this by setting the left and right margins to the same width for the #content element, like this:

Though I advise against setting it for all visitors, you could set it for yourself if you want. Just add that to your user css at w:c:gaia:Special:MyPage/monobook.css.

You could add some Javascript so users can click a button to apply the width styles on-demand. That way they wouldn't have to resize their windows and you also wouldn't force your preferred width on anyone who doesn't want it.