JSFiddle - React, Tailwind, and code Playground

HTML

<div>Hello!</div>
<div>Hello!</div>

CSS

div{
      box-sizing:border-box;
      -moz-box-sizing:border-box;
      -webkit-box-sizing:border-box;
      width:100px;
      height:100px;
      border:20px solid red;
      background:green;
      margin:10px;
    }

div + div{
    border:10px solid red;
}