What's wrong with my Movement Test? Shouldn't it be working?

Question

https://code.sololearn.com/WelY4LI5fX4x/?ref=app

Answer 1

Ok, so how can I make it move up and down?

Answer 2

Ok thanks, I'll try it

Answer 3

up and down arent valid css properties

Answer 4

top property for up and down, left property for left and right