JSFiddle - React, Tailwind, and code Playground

HTML

<ul>
    <li><button>Test</button></li>
    <li><a>Test</a></li>
</ul>

CSS

button, a {
    height: 30px;
    border: solid 1px red;
    padding: 0 20px;
    float: left;
    display: block;
    background: black;
    color: white;
}