JSFiddle - React, Tailwind, and code Playground

HTML

<div class="outer">
    <div class="inner"></div>
</div>

CSS

*, *:before, *:after {
    -webkit-box-sizing: border-box;
    -moz-box-sizing: border-box;
    box-sizing: border-box;
}
html, body {
    width: 100%;
    height: 100%;
    padding: 10px;
}
div.outer {
    border: 5px solid #000;
    background: #ccc;
    width: 400px;
    height: 90%;
    position: relative;
}
div.inner {
    border: 5px solid blue;
    background: #fff;
    width: 80%;
    height: 100%;
    margin: auto;
    -webkit-box-shadow: 0 0 1.5em 0.5em red;
    -khtml-box-shadow: 0 0 1.5em 0.5em red;
    -moz-box-shadow: 0 0 1.5em 0.5em red;
    -ms-box-shadow: 0 0 1.5em 0.5em red;
    -o-box-shadow: 0 0 1.5em 0.5em red;
    box-shadow: 0 0 1.5em 0.5em red;
}
div.outer:before, div.outer:after {
    content:'';
    -webkit-background-size: 10% 100%;
    -khtml-background-size: 10% 100%;
    -moz-background-size: 10% 100%;
    -ms-background-size: 10% 100%;
    -o-background-size: 10% 100%;
    background-size: 10% 100%;
    width: 10%;
    height: 100%;
    position: absolute;
    top: 0;
}
div.outer:before {
    background: url(https://freebestwallpaper.files.wordpress.com/2012/02/amazing-background-1.png) no-repeat left bottom fixed;
    left: 0;
}
div.outer:after {
    background: url(https://freebestwallpaper.files.wordpress.com/2012/02/amazing-background-1.png) no-repeat left bottom fixed;
    right: 0;
}