What you see is the 100 day moving average (blue line in the middle) with percentage bands attached to it.
Each color has a 5% range.
The brightest green color is 20%-25% below the 100 day moving average.
The brightest red color is 20%-25% above the 100 day moving average.
The behaviour of the stock price between the bands could give you trading ideas.
The moving average length is adjustable.
The range between the bands is not adjustable (maybe in future updates).
Enjoy:)