JSFiddle - React, Tailwind, and code Playground

HTML

<h1>h1</h1>
<h2>h2</h2>
<h3>h3</h3> 
<h4>h4</h4>
<h5>h5</h5>
<h6>h6</h6>

CSS

h1,h2,h3,h4,h5,h6{display: inline-block}