JSFiddle - React, Tailwind, and code Playground

HTML

<div>content</div>
<div id="preloader">
  <div id="uno"></div>
</div>

CSS

#preloader{
  position: fixed;
  top: 0;
  right: 0;
  bottom: 0;
  left: 0;
  background: royalblue;
  animation: hide 1s 4s forwards;
}
@keyframes hide {
  0% {
    opacity: 1;
    visibility: visible;
  }
  90% {
    opacity: 0;
    visibility: visible;
  }
  100% {
    opacity: 0;
    visibility: hidden;
  }
}
#uno{
  position: absolute;
  top: 50%;
  left: 50%;
  width: 20px;
  height: 20px;
  border-radius: 50%;
  background: white;
  animation: load .3s infinite;
}
@keyframes load {
  0% {
    transform: translate3d(0, 0, 0);
  }
  25% {
    transform: translate3d(20px, 0, 0);
  }
  50% {
    transform: translate3d(20px, 20px, 0);
  }
  75% {
    transform: translate3d(0px, 20px, 0);
  }
  100% {
    transform: translate3d(0px, 0px, 0);
  }
}