JSFiddle - React, Tailwind, and code Playground

HTML

<div class="black"></div>
<div class="white"></div>

CSS

div {
    width: 50px;
    height: 50px;
    display: block;
}

.black {
    background: #000;
    border: 1px solid #fff;
    box-shadow:  0px 0px 0px 1px #BDBDBD; 
    margin: 25px;
}

.white {
    background: #fff;
    border: 1px solid #BDBDBD;
    top: 35px;
    left: 35px;
    margin: -50px 0px 0px 50px;
}