title: How to place a div center of the window after scrolling
body: <p>I am having a div, which should be centre of the window, even after scrolling. How to achieve it</p>
  
  <p><a href="http://www.flickr.com/photos/41695354@N08/4496376638/" rel="noreferrer">http://www.flickr.com/photos/41695354@N08/4496376638/</a></p>