JSFiddle - React, Tailwind, and code Playground

by web tiki

HTML

<div id="div1"></div>

CSS

html, body {
    height:100%;
    margin:0;
}
#div1 {
    position:relative;
    margin:20px auto;
    width:20%;
    padding-bottom:20%;
    background-color:white;
    border:1px solid black;
}
#div1:before {
    content:'';
    position:absolute;
    top:-1px; left:-1px;
    border:1px solid #fff;
    height:100%;
    width:100%;
    border-radius: 10%;
}