[mediocregopher]

I'm no javascript expert so this is probably not the prettiest way of doing this, but:

javascript:void(document.getElementsByTagName("body")[0].bgColor="#eeeeee");void(document.getElementsByTagName("body")[0].text="#333333");

Makes the article readable

[jrajav]

If you want to set up a quick way to make any article readable, you can make a bookmarklet (Javascript bookmark that runs on the current page) for it here: http://readable-app.appspot.com/setup.html

Not affiliated.

[lmm]

That won't let me set the width above 80%, so I prefer http://evernote.com/clearly/ . (Again, not affiliated)

[cynwoody]

Or open the Inspector and add some rules for body:

  margin: auto 20%;
  background-color: whitesmoke;
  color: black;