React Remove Item From Array

<!DOCTYPE html>
<html>
<head>
    <meta charset="UTF-8" />
</head>
<body>
    <div id="app"></div>
    <script src="https://unpkg.com/react@17.0.2/umd/react.development.js"></script>
    <script src="https://unpkg.com/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>

);
        }

ReactDOM.render(<App />, document.getElementById("app"));
    </script>

.container {
            margin: 0 auto;
            width: 600px;
            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);
            padding: 20px;
        }

.container h2 {
            font-size: 24px;
            font-weight: bold;
            margin-bottom: 10px;
        }

.container p {
            font-size: 18px;
            margin-top: 0;
        }
    </style>
</body>

</html>