How do I transition my background color with these two gradients

Question

https://code.sololearn.com/WHSjbxcUqBsc/?ref=app

Answer 1

https://code.sololearn.com/W1cTyb9T7s2W/?ref=app

Answer 2

Try this brief lesson

https://code.sololearn.com/W8q3WQ3ngefp/?ref=app