JSFiddle - React, Tailwind, and code Playground

HTML

<div class="parent">
  <div class="child">
  </div>
</div>


<div class="parent">
  <div class="child">
  </div>
</div>

<div class="parent">
  <div class="child">
  </div>
</div>

CSS

.parent {
  position:relative;
  width:100px;
  height:100px;
  background:red;
  display:inline-block;
  float:left;
  margin-right:6px;
}

.child {
  width:inherit;
  height:30px;
  position:absolute;
  bottom:0;
  background-color:blue;
  opacity:0;
  transition:0.5s;
}

.child.hover {
  opacity:1;
}

JavaScript

jQuery(document).ready(function($) {

   $(".parent").hover(function() {
      $(this).find(".child").toggleClass("hover");
   });

});