Add scroll down arrow to color section class question

Hello,

I would like to add the scroll down arrow from the fullscreen slider to a color section. I found this post by Ismael https://kriesi.at/support/topic/buttonicon-to-anchor/#post-325401

However I am failing here with the class e.g. scroll-down. Could you please tell me as a slow person ;)

1. what should be in this class “scroll-down”. Where should I add it’s content, into the Quick CSS?
2. Should I add that class into the user specific CSS field of the according color section?

In short, what do I have to do after I added Ismael’s code into the functions.php and uploaded it…?

Thank you guys very much!