Create a Simple Calculator with JavaScript

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Simple Calculator</title>
    <style>
        input[type="text"] {
            width: 100%;
            padding: 10px;
            margin-bottom: 10px;
        }
        button {
            padding: 10px 20px;
            font-size: 16px;
            cursor: pointer;
        }
    </style>
</head>
<body>
    <h2>Simple Calculator</h2>
    <input type="text" id="num1" placeholder="Enter first number">
    <input type="text" id="num2" placeholder="Enter second number">
    <br>
    <button onclick="add()">Add</button>
    <button onclick="subtract()">Subtract</button>
    <button onclick="multiply()">Multiply</button>
    <button onclick="divide()">Divide</button>
    <br>
    <input type="text" id="result" placeholder="Result" readonly>
    
    <script>
        function add() {
            var num1 = parseFloat(document.getElementById('num1').value);
            var num2 = parseFloat(document.getElementById('num2').value);
            document.getElementById('result').value = num1 + num2;
        }
        
        function subtract() {
            var num1 = parseFloat(document.getElementById('num1').value);
            var num2 = parseFloat(document.getElementById('num2').value);
            document.getElementById('result').value = num1 - num2;
        }
        
        function multiply() {
            var num1 = parseFloat(document.getElementById('num1').value);
            var num2 = parseFloat(document.getElementById('num2').value);
            document.getElementById('result').value = num1 * num2;
        }
        
        function divide() {
            var num1 = parseFloat(document.getElementById('num1').value);
            var num2 = parseFloat(document.getElementById('num2').value);
            if (num2 === 0) {
                alert("Cannot divide by zero!");
                return;
            }
            document.getElementById('result').value = num1 / num2;
        }
    </script>
</body>
</html>