html, body {
    margin: 0;
    padding: 0;
    width: 100%;
    height: 100%;
}
body {
    background: url("chmielewska.jpg") no-repeat center fixed;
    background-size: 100% 100%;
    @media (max-aspect-ratio: 3/2) {
        background-size: 150dvh 100%;
        background-position: center center;
    }
}