JSFiddle - React, Tailwind, and code Playground

HTML

<div id="ppp" style="color: #000000; border:2px solid; width:155px; height:55px;"> див не реагирует</div>

JavaScript

var bobik = document.getElementById('ppp');
bobik.onmouseover = function() {this.style.color = '#ff0000';};
bobik.onmouseout = function() {this.style.color = '#000000';};