title: Gist -- how to set the height and width of an embedded Gist
body: <p>For purposes of embedding very long Gists from Github in a Wordpress blog, what code will permit me to set the height so that vertical scroll-bars are generated?  Something around 500px would be perfect.</p>
  
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  <p><strong>EDIT</strong>:  The issue is now resolved, but I spent so much time on this issue, I believe it would be helpful to have a thread dedicated to that issue.  I've posted an answer below that is working.</p>