<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<body>
    <form action="/calculate" method="POST">
        <input type="number" name="num1" placeholder="Enter first number" required>
        <input type="number" name="num2" placeholder="Enter second number" required>
        <button type="submit">Calculate</button>
    </form>
</body>
</html>