body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background-color: #f1f5f9;
    color: #333;
    flex-direction: column;
    display: flex;
    align-items: center;
    padding: 50px;
}

label {
    font-size: 1.2rem;
    margin-bottom: 8px;
}

input[type="number"] {
    padding: 8px 12px;
    font-size: 1rem;
    border: 1px solid #ccc;
    border-radius: 6px;
    margin: 10px 0;
    width: 150px;
    text-align: center;
}

button {
    padding: 8px 16px;
    margin: 5px;
    font-size: 1rem;
    border: none;
    border-radius: 6px;
    cursor: pointer;
    background-color: #3b82f6;
    color: white;
    transition: background-color 0.3s ease;
}

button:hover {
    background-color: #2563eb;
}

span {
    display: block;
    margin: 10px 0;
    font-size: 1.1rem;
    font-weight: 500;
}

#message {
    font-size: 1rem;
    color: #ef4444;
    margin-top: 20px;
    font-weight: 500;
}