JSFiddle - React, Tailwind, and code Playground

HTML

<ul>
    <li style="background: #f00;" >a</li>
    <li style="background: #00f">dfgdfgdfgdfg</li>
    <li style="background: #f0f;">c</li>
</ul>

CSS

ul { display: table; width: 100%; }
li { display: table-cell; }