JSFiddle - React, Tailwind, and code Playground

HTML

<body>
<div class="box1">
  <span></span>
</div>
</body>

CSS

html, body {
  height: 100%;
}
.box1 {
  background: url(http://cdn.wallpapersafari.com/23/44/2mYJfU.jpg) no-repeat;
  height: 60%;
  width: 60%;
  background-size: cover;
}