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);