JSFiddle - React, Tailwind, and code Playground

HTML

<div class="full-width">
    <div class="wrap">
        <h1>My website!</h1>
        <p>Hello, world!</p>
    </div>
</div>

CSS

div.full-width {
    width:100%;
}

div.wrap {
    border:1px solid #000;
    width:500px;
    margin:0 auto;
}