JSFiddle - React, Tailwind, and code Playground

HTML

<div class="loading">Loading</div>

CSS

.loading {
  font-size: 30px;
}

.loading:after {
  overflow: hidden;
  display: inline-block;
  vertical-align: bottom;   
  /* animation: ellipsis-dot steps(40, start) 9000ms infinite; */
  animation: ellipsis-dot 5s infinite;
  
  content: "\2026"; /* ascii code for the ellipsis character */
  width: 0em;
}

@keyframes ellipsis {
  to {    width: 1.25em;  }
  
}