JSFiddle - React, Tailwind, and code Playground

HTML

<div id="font-box">
    <p>font-size: 1.5em; line-height: 2em;</p>
</div>

CSS

#font-box {
    font-family: Arial, sans-serif;
    font-size: 20px;
}

#font-box p {
    outline: 1px solid #f00;
    font-size: 1.5em;
    line-height: 2em;
}