JSFiddle - React, Tailwind, and code Playground

HTML

<div id="box" class="box-shadow">
    
</div>

CSS

div{
    width: 100px;
    height: 100px;
    background-color: red;
}

.box-shadow{
       -webkit-box-shadow: 1px 1px 0.25em 0.25em #a8a8a8;
     box-shadow: 1px 1px 0.25em 0.25em #a8a8a8;  
}