title: Facebook like button's "comments popup window" is half displayed
body: <p>I'm using Twenty Eleven theme of WordPress.</p>
  
  <p>In other themes, there is no problem but in twenty eleven there is a problem with Facebook like button's comments popup window. it's half shown. when I click "Like" button, the view is like below:</p>
  
  <p><img src="https://i.stack.imgur.com/Hgawi.png" alt="enter image description here"></p>
  
  <p>You can see the website at: <a href="http://www.deneyimokulu.com/" rel="nofollow noreferrer">http://www.deneyimokulu.com/</a> </p>
  
  <p>I use Facebook plugin for Wordpress. How can I fix this problem?</p>