JSFiddle - React, Tailwind, and code Playground

HTML

<!DOCTYPE html>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title></title>
    </head>
 <body>
    <div></div>
 </body>
</html>

CSS

body {
background: green;
    padding: 50px;
}

div {
width: 100px;
height: 100px;
position: relative;
border: 2px dashed black;   
}

div:after {
position: absolute;
top:-1px;
left: -1px;        
content: '';    
width: 100px;
height: 100px;
border: 1px solid green;
}