JSFiddle - React, Tailwind, and code Playground

HTML

<div class="list">
    <div class="woof">
        <div class="box">
            cheese
        </div>
    </div>
    <div class="woof">
        <div class="box">
            cheeseburger
        </div>
    </div>
</div>
<div id="console"></div>

CSS

.background-blue {
    background-color: blue;
}

JavaScript

$(document).ready(function () {
    $('.list').find(".box").filter(function(){ return $(this).text().trim().toLowerCase() === 'cheese';}).addClass("background-blue");
});