I just took a brief few-minutes look, and so far the only visual offense I'm seeing is a black terminal in a white page. It actually looks pretty well done!
https://github.com/alexmojaki/futurecoder/issues/212 https://github.com/alexmojaki/futurecoder/issues/226 https://github.com/alexmojaki/futurecoder/issues/253 https://github.com/alexmojaki/futurecoder/issues/259