I'm sorry, I'm not a fantastic coder.
So I tested the class thing like in the instructions, and all it did was put that code in the header.
If I do get the classes to work, I add the class to the new module in my templatedetails.xml file? And then, so the module doesn't show up twice, I add a hide mobile class to the module I'm using for the desktop version?
Also, were the advanced and documentation links in your above post supposed to still go to the using browser to detect class instructions, or were they supposed to be other links?
Thanks so much for your help!