JSFiddle - React, Tailwind, and code Playground

HTML

<div class="div1">
  TEXTTExTTEXT
</div>
<div class="div2" style="background:yellow;">
  TEXTTExTTEXT
</div>

CSS

.div1 {
  background: white;
}

JavaScript

alert("DIV 1 =" + document.getElementsByClassName("div1")[0].style.background);
alert("DIV 2 =" + document.getElementsByClassName("div2")[0].style.background);