Piano Keys Project

I have created this beautiful Project, but I got error and I am not able to solve that error, I am stuck, can any one will help me to solve this problem, when I click on line2 button it will not working.
Project link: https://assadsharif.github.io/pianokeys.github.io/

Shouldn’t you be using    =    instead of    -    ?

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mtrtmk,
Thank you for the solving my problem.

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