Css move down animation how to achieve it?

the effect is shown in the figure:

clipboard.png

clipboard.png

when you click, it displays a box that I use to show the hidden implementation, without animation. Now the product requires the box to be animated down when clicked and animated up when closed. How can this be realized?

Css3-Animation css3 html5 css
Apr.21,2022

add a height to the box. After clicking, the height changes from 0 to 100%
assuming that the height is 300, just change the dispalay directly 

@keyframes animateName {
  from {
    height: 0;
  }
  to {
    height: 300px;
  }
}

wrote a demo, which I hope will be useful to you. 

  https://codepen.io/mudontire/...

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