CODE EXAMPLE FOR SHELL

react-loader-spinner

import React from 'react';
import "react-loader-spinner/dist/loader/css/react-spinner-loader.css";
import Loader from "react-loader-spinner";
import '../style.css';
const LoaderComponent = () => {
    return (
        <div className="loader">
            <Loader
                type="Circles"
                color="#dc1c2c"
                height={50}
                width={100}
                //timeout={1000} //3 secs
            />
        </div>
    );
};

export default LoaderComponent;

style.css
===
.loader {
  position: fixed;
  width: 100vw;
  height: 100vh;
  top: 0;
  left: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 10;
  animation: bg 1s;
}