How to make collapsible rows open smoothly?

The collapsible rows open too rough and I don’t know how to make them open more smoothly. Anyone who knows what to do let me know please.https://youtu.be/Rx-_B8YC6dw

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@ClaudiuStoica

yes, please try to this https://codepen.io/fainder/pen/qBwBeO

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I’m new in all this, mind if I ask where do I need to put all that code?