JSFiddle - React, Tailwind, and code Playground

HTML

<h1><span>Lorem ipsum dolor sit amet, consectetur adipisicing elit. Impedit minus accusantium ipsum optio natus quasi aliquid recusandae, libero incidunt possimus doloremque in molestiae ad assumenda adipisci dolores eum nulla, id.</span></h1>

CSS

h1 span {
  display: inline;
  border-bottom: 2px dotted red;
  color: red;
}