JSFiddle - React, Tailwind, and code Playground

HTML

<html font-size: 1em>

</html>
<div>
    Love for all, hatred for none!
</div>
<p>This is 16px font..</p>

CSS

body {
    font-size: 40px;
}

div {
    font-size: 1em;
}

p {
    font-size: 16px;
}