JSFiddle - React, Tailwind, and code Playground

HTML

<h1>Lorem ipsum dolor sit amet <span></span></h1>

CSS

h1 {
  font-size: 20px;
  padding-right: 20px;
  display: inline-block;
}

h1 span {
  height: 20px;
  margin-bottom: -4px;
  width: 2px;
  background: black;
  opacity: 0;
  display: inline-block;
  animation: blink 1s linear infinite alternate;
}

@keyframes blink {
  50% {
    opacity: 0;
  }
  100% {
    opacity: 1;
  }
}