I gave up watching the show altogether after season 3 but it's mostly animation and fake screens to make it look more appealing to audience.

Nothing on Hollywood computers (with very few exception close to reality like The Social Network or Mr. Robot) is real. It's all flash animation. Even Mr. Robot (which has a team of computer security experts and hackers as technical consultants) uses flash animation and nothing is real.

They seem to be pretty similar. But my question is, how do they provide what is inside the computer? Normally you expect to see a Windows/Linux or a Mac. Is it all animation?

I have watched Mr. Robot. It still has a few errors but other than that, it's pretty accurate.