JSFiddle - React, Tailwind, and code Playground

HTML

<div id='div1'>1</div>
<br>
<div id='div2'>2</div>

CSS

#div1, #div2 {
  background-color: red;
  width: 50px;
  height: 50px;
}
.hovered {
  background-color: blue !important;
}

JavaScript

$('#div1').hover(function(){
	$('#div2').toggleClass('hovered');
});