title: Is it feasible to change the CSS of the Google Doc interface with Google Apps Script?
body: <p>Using Google Apps Script or any other way, is it possible to modify the Google Doc interface to my liking? Is there a way to inject my CSS over Google Doc's own? When I open documents from my site, I would like to modify the Google Doc interface so it looks like my website.</p>
  
  <p>Right now, I've set up a service account and made a website where I can manage a Drive and many Google documents.</p>