I’ve just started a course with Codeacademy, and so far all the informational lessons have had a dark mode theme.
While it looks nice, unfortunately I find it quite challenging to read light text on dark background. I get a sort of slight double-vision effect.
Unless I’m being dense, I can’t figure out where to change it to light mode. Hopefully someone can help me out, thank you 
Unfortunately you can’t in a way that’s officially supported, but if you have a look there are browser extensions that might allow you to invert the colours.
I’m only familiar with extensions that go from light → dark mode, or else I’d recommend some but I assume colour-changing extensions outside that would exist if you have a research around 
That’s a shame.
Thanks for the idea about looking for an extension or inverting the colours though. It’s a bit of faffing about, but I can use the OS accessibility settings to invert the colours. Looks a bit weird, but at least I’ll be able to read it properly!
If anyone from Codeacademy is reading this: Accessibility isn’t really something you should just ignore. Particularly if you’re literally running a web development course 