<ul id="list">
  <li>Milk</li>
  <li>Bread</li>
  <li>Eggs</li>
</ul>
html, body {
  height: 100%; 
}

body {
  display: grid;
  justify-items: center;
  align-items: center;
}
const list = document.getElementById('list')
const firstItem = list.firstElementChild
const nextItem = firstItem.nextElementSibling

nextItem.style.color = 'red'

External CSS

  1. https://cdnjs.cloudflare.com/ajax/libs/twitter-bootstrap/4.1.3/css/bootstrap.min.css

External JavaScript

This Pen doesn't use any external JavaScript resources.