JSFiddle - React, Tailwind, and code Playground

HTML

<fieldset>
    <legend>My legend</legend>
    
    <label for="some_text">Some Text:</label>
    <input type="text" name="some_text" />
    <br />
    
    <label for="some_selection">Some selection:</label>
    <input type="radio" name="some_selection" value="0"/>
    <input type="radio" name="some_selection" value="1"/>
</fieldset>

JavaScript

$('fieldset :input').addClass('newClass');