JSFiddle - React, Tailwind, and code Playground

HTML

<div class="my-div">
    Some content goes here.
    Some content goes here.
</div>

CSS

body {padding: 20px;}

.my-div {
    position: relative;
    height: 200px;
    width: 200px;
    background-color: #DCDCDC;
    padding: 4px;
}
.my-div:after {
    content: '';
    position: absolute;
    top: -3px;
    left: -3px;
    bottom: -3px;
    right: -3px;
    border: 1px #888 solid;
}