JSFiddle - React, Tailwind, and code Playground

HTML

<div class="container">
    <img class="hintergrund" src="http://placekitten.com/g/800/1200" />
    <div class="wrapper">
        <div class="header">
            <img src="header.jpg" />
        </div>
    </div>
</div>

CSS

.container {
    position: relative;
    height: 100%;
    width: 100%;
}

.hintergrund {
    position: absolute;
    z-index: -10;
    height: 100%;
    width: 100%;
    background: red;
}

.wrapper {
    min-width: 20%;
    max-width: 75%;
    margin: 10px auto;
    border: 2px solid black;
}