Rendering my project in CodePen - what have I missed?

I built my Drum Machine project in Atom and it’s rendering fine, but I’ve tried to transfer my code across to CodePen to pass the tests and it isn’t rendering there. I’ve set the code out in the same way as the example project (as far as I can tell), but no luck.

Can you have a look over the project and tell me what I’ve missed?

https://codepen.io/sophie-chapman/pen/KKPvebr

here is one problem with it:
inside your class component Controls change props.display on line 122 to this.props.display
it will fix that issue

Thank you! That did it.

I knew I needed to have someone else have a look at it when my eye started to twitch…

I appreciate you taking the time.

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