JSFiddle - React, Tailwind, and code Playground

HTML

<ul>
        <li>thing</li>
        <li>thing2</li>
        <li>thing3</li>
        <li>thing4</li>
        <li class="hack"></li>
</ul>

CSS

ul { text-align: justify }
li { background: red; display: inline-block }
li.hack {width: 100%}