JSFiddle - React, Tailwind, and code Playground

HTML

<div>
  <h1>A</h1></div>
<div>
  <h1>B</h1></div>
<div>
  <h1>C</h1></div>

CSS

div h1:nth-child(1) {
  color: green;
}
div h1:nth-child(2) {
  color: blue;
}