JSFiddle - React, Tailwind, and code Playground

HTML

<div id="boton">Hello</div>

CSS

#boton {
width:200px;
height:30px;
border:1px solid;
background-color:#cccccc; }

#boton.botoncla {
    background-color:#FF0000; 
    
    }

JavaScript

$("#boton").hover(function(){
    $(this).addClass("botoncla", 1000);
  }, function(){
    $(this).removeClass("botoncla", 1000);
 });