body {
    font-family: Arial, sans-serif;
    transition: background-color 0.5s ease;
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100vh;
    margin: 0;
}

.center {
    text-align: center;
}

.light-mode {
    background-color: white;
    color: black;
}

.dark-mode {
    background-color: black;
    color: white;
}

button {
    display: inline-block;
    padding: 10px;
    border: none;
    cursor: pointer;
}