JSFiddle - React, Tailwind, and code Playground

HTML

<h1><span>The quick brown fox jumps over the lazy dog.</span></h1>

CSS

h1 {
  font-weight: 800;
  font-size: 5em;
  line-height: 1.35em;
  margin-bottom: 40px;
  color: #fff;
}

h1 span { 
  background-color: rgba(0, 0, 0, 0.5); 
  padding: 0 20px;
  -webkit-box-decoration-break: clone;
  box-decoration-break: clone;
}