I really appreciate your working this out. One problem: the entire contents of Main.css — except for the initial comments — are on one line. Doesn’t look like there is an easy way to temporarily change that then change it back. (It’s not a question of which line endings are used.) What did you do? (And whatever it was, you should add it to your instructions.)
I did that so long ago I barely remember it, so I can’t be of much help now.
You’ll just have to do the ole “trial-and-error” method until you find something that works.
All I can say is that the approach I described in my Gist worked for me at the time.