JSFiddle - React, Tailwind, and code Playground

HTML

<div id="main">
		<p>Welcome ! =)</p>
<p>Welcome2 ! =)</p>
<p>Welcome3 ! =)</p>
<p>Welcome4 ! =)</p>
	</div>

CSS

body > div#main p:nth-child(2n+4) {
    background-color: #f00;
}