JSFiddle - React, Tailwind, and code Playground

HTML

<div id="border">
    <div></div>
</div>

CSS

#border {
    width: 100px;

}

#border > div {
    width: 100px;
    height: 100px;
    background:#fff ;
    border:1px solid #999;
    -moz-box-shadow:0 5px 5px rgba(182, 182, 182, 0.75);
     -webkit-box-shadow: 0 5px 5px rgba(182, 182, 182, 0.75);
     box-shadow: 0 5px 5px rgba(182, 182, 182, 0.75);