SOLUTION: Dark Mode (Chrome Add-On)

For everyone interested in using Dark Mode, as Khan Academy has not yet been able to implement it directly onto the platform, here's what I use:

https://chromewebstore.google.com/detail/dark-reader/eimadpbcbfnmbkopoojfekhnkhdbieeh?pli=1

It is called "Dark Reader" and will make any website page you visit a "dark" website. I have used this for years and have never had a problem. It looks great on Khan btw

Hope you enjoy