Whats the syntax error here?

Question

I really dont know. What is the argument list? I have done html and css but im new to javascript.
https://code.sololearn.com/WZicl31G3kEg/?ref=app

Answer 1

You seem to have forgotten a comma between null and 0.8, so adding it in should allow it to function correctly 👍

Answer 2

Ill try that

Answer 3

It works thanks Faisal!