JSFiddle - React, Tailwind, and code Playground

HTML

<ul>
        <li>Item 1</li>
        <li>Item 2</li>
        <li>Item 3</li>
        <li class="hideme">Item 4</li>    
</ul>

CSS

.hideme {
    display:none;
}

.red {
    color: red;
}
}

JavaScript

$('li').not(':hidden').last().addClass("red");