title: iframe in salesforce modal pop up, entire page greys out
body: <p><a href="https://stackoverflow.com/questions/21757961/css-modal-window-and-iframe">CSS Modal window and iFrame</a></p>
  
  <p>I am using the code in the above link to show modal pop up in salesforce. When i put Iframe in the modal pop-up the entire page greys out. Any idea what needs to be corrected?</p>