Add Remove Class to Body

<!DOCTYPE html>
<html>
  <head>
    <script src="https://cdnjs.cloudflare.com/ajax/libs/react/17.0.2/umd/react.development.js"></script>
    <script src="https://cdnjs.cloudflare.com/ajax/libs/react-dom/17.0.2/umd/react-dom.development.js"></script>
    <script src="https://cdnjs.cloudflare.com/ajax/libs/babel-standalone/6.26.0/babel.min.js"></script>
  </head>

<body>
    <div id="app"></div>
    <script type="text/babel">
      const { useEffect, useState } = React;
      const App = () => {
        const [isBodyClassActive, setIsBodyClassActive] = useState(false);

useEffect(() => {
          if (isBodyClassActive) {
            document.body.classList.add("active");
          } else {
            document.body.classList.remove("active");
          }
        }, [isBodyClassActive]);

const toggleBodyClass = () => {
          setIsBodyClassActive(!isBodyClassActive);
        };

return (
          <div className="container">
            <h3>React Js Add Remove class to Body Tag | Toggle class</h3>
            <button onClick={toggleBodyClass}>Toggle Body Class</button>
          </div>
        );
      };

ReactDOM.render(<App />, document.getElementById("app"));
    </script>
    <style>
      body.active {
        background-color: lightblue;
      }

.container {
        text-align: center;
        margin-top: 100px;
      }

button {
        padding: 10px 20px;
        font-size: 18px;
        background-color: #4caf50;
        color: white;
        border: none;
        cursor: pointer;
      }
    </style>
  </body>
</html>