JSFiddle - React, Tailwind, and code Playground

HTML

<div id="mybox">ABC</div>

CSS

#mybox {
box-shadow:
  0 0 0 1px #CCC,
  0 0 0 2px #888,
  0 0 0 3px #444,
  0 0 0 4px #000;
-moz-box-shadow:
  0 0 0 1px #CCC,
  0 0 0 2px #888,
  0 0 0 3px #444,
  0 0 0 4px #000;
-webkit-shadow:
  0 0 0 1px #CCC,
  0 0 0 2px #888,
  0 0 0 3px #444,
  0 0 0 4px #000;
}