JSFiddle - React, Tailwind, and code Playground

by Mostafa Zeinivand

HTML

<div class="trigger">
  Hover me to see a height transition.
  <div class="el">Additional content</div>
</div>

SCSS

.trigger {
  background: black;
  color: white;
  border-radius: 5px;
  padding: 5px;
  transition: max-height 0.3s;
  overflow: hidden;
  
  .el {
    max-height: 0;
}
  
  &:hover > .el {
    max-height: 100%;
  } 
}