JSFiddle - React, Tailwind, and code Playground

HTML

<ul>
    <li><input type="text" id="c1" class="casella" /></li>
    <li><input type="text" id="c2" class="casella" /></li>
    <li><input type="text" id="c3" class="casella" /></li>
</ul>
<input type="button" onclick="javascript:coloraCaselle('casella', '#f00');" value="Colora le caselle" />

JavaScript

window.coloraCaselle = function (nomeClasseCss, colore) {
    $("." + nomeClasseCss).css('background-color', colore);
}