JSFiddle - React, Tailwind, and code Playground

HTML

<div> Hello World! </div>

CSS

div {
    background-color: red;
}

.blue {
    background-color: blue;
}

JavaScript

$("div").hover(
    function(){
    $(this).addClass("blue");
   }
    ,
   function(){
    $(this).removeClass("blue");
   } 
 );