JSFiddle - React, Tailwind, and code Playground
HTML
<div class="ramka"></div>CSS
body{
margin:0;
padding:0;
height:100%;
background:#ccc;
}
.ramka{
margin:100px auto;
width:300px;
height:300px;
background:#ccc;
outline:2px solid #fff;
border:2px solid #000;
box-shadow:inset 0px 0px 0px 2px #fff;
}