body {
            font-family: Arial, sans-serif;
            display: flex;
            justify-content: center;
            align-items: center;
            height: 100vh;
            margin: 0;
            background-color: #f4f4f4;
        }

        form {
            background: white;
            padding: 20px;
            border-radius: 8px;
            box-shadow: 0 0 10px rgba(0, 0, 0, 0.1);
            width: 300px;
        }

        div {
            margin-bottom: 15px;
        }

        label {
            display: block;
            margin-bottom: 5px;
        }

        input[type="text"],
        input[type="number"] {
            width: 100%;
            padding: 8px;
            box-sizing: border-box;
            border: 1px solid #ccc;
            border-radius: 4px;
        }

        button {
            width: 100%;
            padding: 10px;
            background-color: #28a745;
            color: white;
            border: none;
            border-radius: 4px;
            cursor: pointer;
        }

        button:hover {
            background-color: #218838;
        }

        .error {
            color: red;
            font-size: 0.9em;
        }