wiktionary.css

@media (prefers-color-scheme: dark) {
    .skin-vector .NavFrame .NavHead,
    .skin-vector .NavFrame .NavHead:hover {
        background: #757575;
    }
    .skin-vector .NavFrame .NavContent,
    .skin-vector .translations {
        background-color: #616161;
    }
    .skin-vector .translations-cell,
    .skin-vector .checktrans,
    .skin-vector .derivedterms.term-list.ul-column-count {
        background-color: #757575 !important;
    }
    .skin-vector .ttbc,
    .skin-vector .trreq {
        background-color: #8c9eff;
    }
    .skin-vector .tpos a,
    .skin-vector .tpos a .extiw {
        color: #82b1ff !important;
    }
    .skin-vector .tpos a:visited,
    .skin-vector .tpos a:visited .extiw {
        color: #b388ff !important;
    }
    .skin-vector .ttbc,
    .skin-vector .ttbc a,
    .skin-vector .trreq,
    .skin-vector .trreq a {
        color: #212121;
    }
}