JSFiddle - React, Tailwind, and code Playground

HTML

<div class="funny selectthis">
      <p>This is red</p>
      <p>This is whatever</p>
      <p>This is whatever</p>
      <p>This is whatever</p>
    </div>
    
    <div class="wildcrazy">
      <p>This is whatever</p>
      <p>This is whatever</p>
      <p>This is whatever</p>
      <p>This is whatever</p>
    </div>
    
    <div class="sad selectthis">
      <p>This is red</p>
      <p>This is whatever</p>
      <p>This is whatever</p>
      <p>This is whatever</p>
    </div>

JavaScript

$('.selectthis').find('p:first').css('color','red');