JSFiddle - React, Tailwind, and code Playground

HTML

<div id="background"></div>

CSS

#background {
    position: absolute;
    width: 100%;
    height: 100%;
    -webkit-background-size: cover;
    -moz-background-size: cover;
    -o-background-size: cover;
    background-size: cover;
    background: url(http://placehold.it/1920x1080) no-repeat center center fixed;
    filter: blur(7px) brightness(0.75);
    -webkit-filter: blur(7px) brightness(0.75);
    -moz-filter: blur(7px) brightness(0.75);
    -ms-filter: blur(7px) brightness(0.75);
    -o-filter: blur(7px) brightness(0.75);
}