JSFiddle - React, Tailwind, and code Playground

HTML

<div id="left">max 80px content</div>
<div id="right">span fully to what is left on the same line. span fully to what is left on the same line. span fully to what is left on the same line</div>

CSS

div {display: inline-block; border: 1px solid red}
#left {width:80px}
#right {width: auto}