Hey thanks for the feedback, the text should auto scroll, I have setup a minimum of 4 lines at the bottom, but this is maybe broken because of the overflow you talk about. I'm going to update that :)
Also, the two site you show got a shitload of cookie and login requirement. I plan to build something with no data being resold or login. Don't know if its a good idea ^^
I have added 8 different repos (C, go, tsx, sh ts, python), but you can load a custom one, so yes :) The only limit is the tool that I use to highlight the code I guess.