JSFiddle - React, Tailwind, and code Playground

HTML

<div id='a'>A</div><div id='b'>B</div>

CSS

div { display:inline-block; border-style: solid; box-sizing: border-box}
#a { padding: 1px; margin: 2px; border-width: 4px; }
#b { padding: 8px; margin: 16px; border-width: 32px; }