Start by scaffolding a project with the react create app command

npx create-react-app spring-animation
ce spring-animation

Then install react spring animation

npm i s react-spring

We will then import the useSpring hook and animated from react-spring

import { useSpring, animated } from "react-spring";

We want to animated the header div from 100% to 50% and the logo from 100% to 40%. Thus they will initially take their original size and shrink to half of that.Also with a delay of 1000ms.

In our App function we make use of the hook and difine the following

const contentWrapper = useSpring({
    delay: 1000,
    from: { width: "100%" },
    to: { width: "50%" },
  });

const logoWrapper = useSpring({
  delay: 1000,
  from: { width: "100%" },
  to: { width: "40%" },
});

To make use of this in our render app we need to pass them as styles to the element and append the elements with animated.

return (
    <div>
      <animated.div className="App" style={contentWrapper}>
        <header className="App-header">
          <animated.img
            style={logoWrapper}
            src={logo}
            className="App-logo"
            alt="logo"
          />
          <p>
            Edit <code>src/App.js</code> and save to reload.
          </p>
          <a
            className="App-link"
            href="https://reactjs.org"
            target="_blank"
            rel="noopener noreferrer"
          >
            Learn React
          </a>
        </header>
      </animated.div>
    </div>
  );

full code

import React from "react";
import PropTypes from "prop-types";
import { useSpring, animated } from "react-spring";
import logo from "./logo.svg";
import "./App.css";

const App = () => {
  const contentWrapper = useSpring({
    delay: 1000,
    from: { width: "100%" },
    to: { width: "50%" },
  });
  const logoWrapper = useSpring({
    delay: 1000,
    from: { width: "100%" },
    to: { width: "40%" },
  });
  console.log(contentWrapper);
  return (
    <div>
      <animated.div className="App" style={contentWrapper}>
        <header className="App-header">
          <animated.img
            style={logoWrapper}
            src={logo}
            className="App-logo"
            alt="logo"
          />
          <p>
            Edit <code>src/App.js</code> and save to reload.
          </p>
          <a
            className="App-link"
            href="https://reactjs.org"
            target="_blank"
            rel="noopener noreferrer"
          >
            Learn React
          </a>
        </header>
      </animated.div>
    </div>
  );
};

export default App;

All done! you can test your functionality b starting the application