Javascript width based if else condition | React Js

<!DOCTYPE html>
<html>
  <head>
    <meta charset="UTF-8" />
    <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 { useState, useEffect } = React;

const App = () => {
        const [dynamicWidth, setDynamicWidth] = useState("100%");

const handleClick = () => {
          if (dynamicWidth === "100%") {
            setDynamicWidth("50%");
          } else {
            setDynamicWidth("100%");
          }
        };

return (
          <div className='container'>
            <h3>React js width based if else condition</h3>
            <div style={{ width: dynamicWidth, border: "1px solid #333333" }}>
              Font Awesome Icons
            </div>
            <p>width: {dynamicWidth}</p>
            <button onClick={handleClick}>Toggle Width</button>
          </div>
        );
      };

ReactDOM.render(<App />, document.getElementById("app"));
    </script>
    <style>
      .container {
        text-align: center;
        box-shadow: 0 1px 2px 0 rgba(0, 0, 0, 0.12),
          0 2px 4px 0 rgba(0, 0, 0, 0.24);
        width: 600px;
        margin: 0 auto;
        padding: 20px;
      }
    </style>
  </body>
</html>