JSFiddle - React, Tailwind, and code Playground

by meo

HTML

<div>border example</div>
<div>border example</div>

CSS

body {
    padding: 10px;
}
div {
    width: 200px;
    float: left;
    border: 10px solid rgba(0,0,0,.4);
    margin: -10px;
}