JSFiddle - React, Tailwind, and code Playground

HTML

<div class="outer">
    <div class="inner">
        <h3>Watch the parent element's padding change when you narrow the viewport.</h3>
    </div>
</div>

CSS

* {
    -moz-box-sizing: border-box;
    -webkit-box-sizing: border-box;
    box-sizing: border-box; }

.outer {
    max-width: 600px;
    border: 1px solid #0f0;
    padding: 40px 10%; }

.inner {
    border: 1px solid #f00; }