JSFiddle - React, Tailwind, and code Playground

HTML

<textarea>
<div class="quote">
<div class="quotestart"></div>
<div class="quotecontent"><p>We have a new toy!</p>
<div class="author">- Fernando Alonso</div></div>
<div class="quoteend"></div>
</div>

<div class="quote">
<div class="quotestart"></div>
<div class="quotecontent"><p>Fight to fly, fly to fight, fight to win.</p>
<div class="author">- Motto of the U.S. Navy Fighter Weapons School, TOPGUN</div></div>
<div class="quoteend"></div>
</div>
</textarea>

JavaScript

$(".quotecontent").filter(function() {
    return $(this).text().length < 40;
}).parent().css('background', 'red');

//replaced --"width", 500-- with red background, any line with fewer than 40 characters will be red!