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/...

Previous: WeChat Mini Programs on the file download question: how to save PDF locally instead of 'wx.saveFile' saved to local cache, to solve this question, thank you

Next: The problem of time difference calculation of multiple time periods in vue

css mysql arrays josn react html typescript webpack npm sass R objective-c .net sql-server jquery python-3.x angularjs django angular excel regex iphone ajax linux xml pandas vba spring database wordpress string wpf xcode windows bash postgresql oracle multithreading eclipse list firebase algorithm macos forms image scala visual-studio azure bootstrap spring-boot react-native python-2.7 docker performance function winforms matlab powershell apache dataframe api sqlite numpy rest shell selenium flutter dart maven loops qt swing android-studio csv express file class tensorflow sorting codeigniter perl
MySQL Query : SELECT * FROM `codeshelper`.`v9_news` WHERE status=99 AND catid='6' ORDER BY rand() LIMIT 5
MySQL Error : Disk full (/tmp/#sql-temptable-64f5-1b36bb9-4d6d6.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
MySQL Errno : 1021
Message : Disk full (/tmp/#sql-temptable-64f5-1b36bb9-4d6d6.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
Need Help?