JSFiddle - React, Tailwind, and code Playground
HTML
<div id="borders"></div>CSS
#borders{position:relative; z-index:10; padding:30px; background:#fff; border:2px solid #390; }
#borders:before{content:""; display:block; position:absolute; z-index:-1; top:2px; left:2px; right:2px;
bottom:2px; border:2px solid #36F}