Difficulty implementing Accordian effect in Angular Project -

I am trying an implementation of Accordian effect in one of my Angular views. The most basic Accordian example you would find over at w3schools. Please take a look at this stackblitz url where I have tried to implement the same, using the same approach I used in my original project.

https://stackblitz.com/edit/stackblitz-starters-v54vdwmj

Nothing is working. What's confusing is that there is no compilation error or runtime errors in the console which really doesn't help at all. Had there been some sort of errors, it would have at least given me a pointer in some direction.

Can you get this accordian stackblitz working? Thanks!

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