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

main {
    color: white;
}

footer.social a.lang {
    border-color: white;
}
footer.social a.lang:hover {
    color: var(--gold);
    background: white;
    border-color: white;
}

body > header.banner img, footer.social a img {
    filter: brightness(10);
}

@media (max-width: 40em) {
    header.slidingmenu > img.button.open {
        filter: brightness(10);
    }
}