JSFiddle - React, Tailwind, and code Playground

HTML

<h1>Kevin Alvarez</h1>

CSS

body {
  text-align: center;
}

h1 {
  font-size: 3.5em;
  border-bottom: 2px solid black;
  
  /* -- reduce the width of the h1 element to the size of it's content -- */
  display: inline-block;
  
  /* -- add extra length to each side -- */
  padding: 0 1.5rem;
}