body {
    background-image: url("/images/birkozas_4_dark.jpg");
    background-position: 0px 0px;
    background-size: cover;
    width: 100%;
    height: 100vh;
}

nav {
    background-color: white;
}

@media screen and (max-width: 650px) {
    body {
        background-position: 40% 0px;
        background-repeat: no-repeat;
        background-size: cover;
        height: 100vh;
    }
}