JSFiddle - React, Tailwind, and code Playground

HTML

<ul>
    <li>One</li>
    <li>Two</li>
    <li>Three</li>
    <li>Four</li>
    <li>Five</li>
    <li>Six</li>
</ul>

CSS

ul {
    list-style: none;
    background: red;
}

li:nth-child(even) {
    padding-left: 0.5em;
    background: purple;
    display: block;
}

li:nth-child(odd) {
    float: left;
    background: green;
    padding-left: 0.5em;
}
}