JSFiddle - React, Tailwind, and code Playground

HTML

<div id="background">
    <div id="content">
        <p>Some centered content</p>
    </div>
</div>

CSS

body{ background: grey;padding:0; margin:0;}

#background{width:100%; background: silver; padding: 10px;}
#content{  
    width: 260px;
    margin: 0 auto;
    background: white;
}