JSFiddle - React, Tailwind, and code Playground

HTML

<div>
box
</div>
<div>
box
</div>

CSS

div {
  margin:0;
  padding:3px;
  background:#dedede;
  color:black;
  box-shadow:-1px 0 1px 1px rgba(0, 0, 0, 0.75), inset -1px 0 0 1px rgba(0, 0, 0, 0.75);
}