Loader

export default function Loader({ show }) {
  return show ? <div className="loader"></div> : null;
}

/* Loader */

.loader {
  border: 10px solid #eef0f1;
  border-top: 10px solid #3b49df;
  border-radius: 50%;
  width: 50px;
  height: 50px;
  animation: spin 2s linear infinite;
}

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

Live Demo Source Code