MediaWiki:Vector-darkmode.less/prefs.less

.oo-ui-tabSelectWidget-framed {
    background-color: #182137;
    border-bottom: 1px solid #596e96;

    .oo-ui-tabOptionWidget.oo-ui-optionWidget-selected {
        background-color: #303f59;
    }

    .oo-ui-tabOptionWidget.oo-ui-optionWidget-selected .oo-ui-labelElement-label {
        border-bottom-color: #596e96;
    }

    .oo-ui-tabOptionWidget.oo-ui-widget-enabled.oo-ui-optionWidget-selected:hover,
    .oo-ui-tabOptionWidget.oo-ui-widget-enabled:active {
        background-color: #303f59;
    }

    .oo-ui-tabOptionWidget.oo-ui-widget-enabled:hover {
        background-color: #303f59;
    }
}

.mw-prefs-buttons {
    background-color: #182137;
    border-top-color: #596e96;
    box-shadow: none;
}
.mw-htmlform-ooui .mw-htmlform-matrix tbody  {
    tr:nth-child(even) td,
    tr:nth-child(even):hover td {
        background-color: #303f59;
    }

    tr:hover td {
        background-color: #182137;
    }
}