JSFiddle - React, Tailwind, and code Playground

HTML

<div id="blanket">
    <h2>text here</h2>
</div>

CSS

body{background:url(http://hidefwalls.com/wp-content/g/backgrounds/18429-hd-color-background-wallpaper.jpg);}

#blanket{background-color:rgba(150,150,150,0.5);
    width:300px;height:300px;border:2px solid #afa;border-radius:10px;}