title: Make Gist embed scrollable
body: <p>is it possible to make gist embed script have vertical scroll bar? I want to embed my gist to my blog post, but it's a long code. I want my gist look like this in my blog post : </p>
  
  <p><img src="https://i.stack.imgur.com/0ElHY.png" alt="Scrollable code container">  </p>