JSFiddle - React, Tailwind, and code Playground

HTML

<div class="loader"></div>

CSS

.loader {
  border: 16px solid lightgrey;
  border-top: 16px solid red;
  width: 40px;
  height: 40px;
  -webkit-animation: spin 2s linear infinite;
  animation: spin 2s linear infinite;
}

@-webkit-keyframes spin {
  0% { -webkit-transform: rotate(0deg); }
  100% { -webkit-transform: rotate(360deg); }
}

@keyframes spin {
  0% { transform: rotate(0deg); }
  100% { transform: rotate(360deg); }
}