body {
    font-family: Arial, sans-serif;
    background-color: white;
    color: black;
    padding: 20px;
}

button {
    margin-right: 10px;
    padding: 8px 12px;
    background-color: lightblue;
    border: none;
    border-radius: 5px;
    cursor: pointer;
}

button:hover {
    background-color: deepskyblue;
}

#demo {
    margin-top: 20px;
    font-weight: bold;
    font-size: 18px;
}