JSFiddle - React, Tailwind, and code Playground

HTML

<div class="button">
    Button
</div>

CSS

.button {
    width: 100px;
    height: 100px;
    background: red;
}

JavaScript

var button = $('.button');

button.hover(
  function() {
    button.animate({
        opacity: 0.25
    })
  }, function() {
    button.animate({
        opacity: 1
    })
  }
);