body {
    font-family: Arial, sans-serif;
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100vh;
    margin: 0;
    background-color: #f4f4f9;
    color: #333;
    transition: background-color 0.3s ease, color 0.3s ease;
}

h1 {
    transition: color 0.3s ease;
}

@media (prefers-color-scheme: dark) {
    body {
        background-color: #222;
        color: #f4f4f9;
    }
}