JSFiddle - React, Tailwind, and code Playground

CSS

html::before {
  content:"";
  position:fixed;
  top:0;
  left:0;
  right:0;
  bottom:0;
  background:
   linear-gradient(rgba(0,0,0,0.2) 0 0),
   url(https://picsum.photos/id/1032/800/800) center/cover;
  filter:blur(5px);
  margin:-10px; /* this will do the trick */
}