JSFiddle - React, Tailwind, and code Playground

HTML

<p>foo<br>bar</p>
<h1>foo<br>bar</h1>

CSS

* {
    font-size:   inherit;
    line-height: inherit;
}
html {
    background-color: pink;
    font-size:   16px;
    line-height: 1.25em;
}
h1 {
    font-size:   4em;
    line-height: 1.25em;
}