Something weird is happening on meta when I click on the "share" link on an answer. It only appears to affect answers and it only appears to happen on meta.
Then I click on "share":
As you can see, the margin to the left of the post reduces in size. Clicking "close" on the share box sets it back to its usual place.
Issue experienced on Google Chrome 31.0.1650.57 m and Internet Explorer 11.0.9600.16438.