Add Two Numbers in React Js

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Add Two Numbers</title>
</head>
<body>
    <h1>Addition of Two Numbers in Javascript</h1>
    <label for="num1" class="input-label">Number 1:</label>
    <input type="text" id="num1" class="input-field">
    <label for="num2" class="input-label">Number 2:</label>
    <input type="text" id="num2" class="input-field">

<p id="result" class="result-text">Result: </p>

// Check if the input is valid
            if (!isNaN(num1) && !isNaN(num2)) {
                // Perform addition
                var sum = num1 + num2;

// Display the result
                document.getElementById("result").innerText = "Result: " + sum;
            } else {
                // Handle invalid input
                alert("Please enter valid numbers");
            }
        }
    </script>
    <style>
        body {
            font-family: 'Arial', sans-serif;
            background-color: #f4f4f4;
            display: flex;
            flex-direction: column;
            align-items: center;
            justify-content: center;
            height: 100vh;
            margin: 0;
        }

.input-label {
            font-size: 16px;
            margin-bottom: 8px;
        }

.input-field {
            padding: 8px;
            margin-bottom: 16px;
            width: 200px;
            border: 1px solid #ccc;
            border-radius: 4px;
        }

.action-button {
            background-color: #4caf50;
            color: white;
            padding: 10px 15px;
            font-size: 16px;
            border: none;
            border-radius: 4px;
            cursor: pointer;
        }

.action-button:hover {
            background-color: #45a049;
        }

.result-text {
            font-size: 18px;
            margin-top: 16px;
        }
    </style>
</body>

</html>