Board Thread:Support Requests - Getting Technical/@comment-26437440-20160905012318

So I was poking around and found this for implementing a dark/light switch and thought it'd be a great idea to use on my own wiki, especially since I edit almost exclusively at night.

The JS code for the button itself is easy enough, but I'm kinda lost on doing the actual CSS for the dark theme. Do I just make a new CSS page with a dark version of my CSS and use that in the JS code, or is it more complicated than that? 