Any advice or idea how to make one of the panel go up?

[hamza-imran75]

I'm trying to implement this feature, but got stuck here. If you could just maybe point me to a couple of lines of code and what to do with them.

https://imgur.com/EumaW82
https://imgur.com/0aNY9xk

As you can see the panel goes up to show the cart when the arrow is clicked.