ERB Studio

A green screen is where EpicLLOYD and Nice Peter rapped against each other in Nice Peter vs EpicLLOYD 2.

Information on the location
In film and video, a green screen is a wall or walls colored a bright green. (Or any other color that stands out.) Green screens are used in chromakeys to replace in a video editing software to a set background. This green screen is the one mostly used for ERB, and can be seen in numerous Behind the Scenes episodes.

Appearance in the rap battle
The green screen was seen in the line "I'm already doing just fine", on a computer screen, but then seen on location on the line "I try to take our little baby in a creative direction". It was then seen again when Peter and Lloyd grab each other's shoulders in anger.