JSFiddle - React, Tailwind, and code Playground

HTML

<img class="bg" src="http://blogs.ubc.ca/CourseBlogSample01/wp-content/themes/thesis/rotator/sample-1.jpg" />
<div class="content">
    <h1>Hello World</h1>
</div>

CSS

.bg
{
    position: absolute;
    width: 100%;
    z-index: 0;
}

.content
{
    margin: 0 auto;
    position: relative;
    width: 500px;
    z-index: 999;
}