JSFiddle - React, Tailwind, and code Playground

HTML

<div class="itemRelated">
    <ul>
        <li class="even">Hi There</li>
        <li class="odd">Whats'up</li>
        <li class="even">BugsBunny</li>

CSS

.cf {
    color:red;
}

JavaScript

$$('.itemRelated li').addClass('cf');