Need help to pass Drum Machine

Good day!
I can’t understand how to pass point 3 in DrumMachine test. Can you explain what Im doing wrong?
https://codepen.io/igor-sushko/full/OGmbjN

ID is needed on the .drum-pad button.

See the line #121 here:
https://codepen.io/anon/pen/eoRMbo?editors=1010

I added -btn to make the IDs unique otherwise they would conflict with the audio element ID

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oh) thank you very much!