Can anyone who knows CSS tell me what the CSS selector for the Twitter Timeline is?

I want to set it visibility to hidden so I can go onto twitter without seeing the TL. I figured out Facebook but the Twitter CSS is too confusing for someone who has just learnt what CSS is

Also, I literally don't even know if I am using the right terms here - I just want to get rid of the timeline by setting the element to invisible but I can't find the element.

Update on this: I am using a CSS style sheet with the code article{visibility: hidden;} but I don't know if you can use an if statement (or similar) to make it apply to only Twitter.

This is for the 1 person who might be googling this issue in the future and finds this thread.