How to make a dropdown animation?

All g'day! How to make a dropdown animation when opening?
here is a screenshot of this telegram in the section configuring
5e418bf6ba728541361639.jpeg


If you click the three dots (which I circled) that it is open + there is beautiful animation, how to do this on css? Can someone encountered such a thing, I would like the finished code))
April 7th 20 at 11:02
0 answer

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