title: Stackedit doesn't accept custom CSS
body: <p>I'm trying to follow this guide:</p>
  <p><a href="https://pacinispace.blogspot.com/2013/07/markdown-stackedits-html-export.html" rel="nofollow noreferrer">AlPacini's Space: Markdown - StackEdit's HTML export template with highlighting by using Prettify or Highlight.js and personalized markDown.css</a></p>
  <p>in order to improve my markdown rendering.</p>
  <p>Now, I simply copied and pasted the default template proposed by this guy. Stackedit should now refer to the custom css shown in the blog post (via google drive), but instead, in the live preview, I cannot observe any change in the way it renders markdown. It seems to still refer to the &quot;base.css&quot;.</p>
  <p>Why?</p>
  <p>Another (related) question: It would be great to customise alternative themes provided by stackedit (solarized, night, etc..).
  It's that possible?</p>
  <p>Thanks.</p>