JSFiddle - React, Tailwind, and code Playground
by 규연 황
HTML
<ul>
<li>01</li>
<li>01</li>
<li>01</li>
<li>01</li>
<li>01</li>
<li>01</li>
<li>01</li>
<li>01</li>
<li>01</li>
<li>01</li>
<li>01</li>
<li>01</li>
<li>01</li>
</ul>
CSS
ul li:nth-child(3n+0) {
background : red;
}