JSFiddle - React, Tailwind, and code Playground

HTML

<div id="container">
    <div id="header">
        Some header content
    </div>
</div>

CSS

#container {
    position:relative;
    width:80%;
    margin: 0 auto;
    border: 1px solid red;
}
#header {
    height:50px;
    margin:10px;
    padding:10px;
    border: 1px solid blue;
}