main {
    display: flex;
    flex-direction: row;
    justify-content: center;
    align-items: center;        
    height: 100vh;
}

body {
    background-color: black;
    color: white;
}

@media (prefers-color-scheme: light) {
    body {
        background-color: white;
        color: black;
    }
}