html, body {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    background-color: white;
    color: black;
}

.img {
    background-image: url('img.jpg');
    background-size: contain;
    background-position: center;
    background-repeat: no-repeat;
    background-color: inherit;
    width: 100%;
    height: 100vh;
}

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