JSFiddle - React, Tailwind, and code Playground

HTML

<div> 
 <span>Colorido!</span>
 <span>Não colorido:(</span>
 <span>Colorido!</span>
 <span>Não colorido:(</span>
 <span>Colorido!</span>
</div>

CSS

span:nth-child(2n + 1) {
    background-color: lime;
}