JSFiddle - React, Tailwind, and code Playground

HTML

<body>
    <div style="background-color:red;">A</div>
    <div style="background-color:blue;">B</div>
    <div style="background-color:green; padding: 10px"> C
        <div style="background-color:yellow;">D</div>
    </div>
</body>

JavaScript

function clearStyles(element) {
    element.setAttribute('style', '');
    for (var i = 0; i < element.children.length; i++) {
        clearStyles(element.children[i]);
    }
}

clearStyles(document.body);