Stack Overflow - New navigation bar dark theme

style.css

@-moz-document domain("stackoverflow.com") {
    body.newheader {
        padding-top: 0;
    }

    .so-header {
        background-color: #333;
        position: relative;
    }

    .so-header .navigation .-link,
    .so-header .secondary-nav .-item .-link,
    .so-header .my-profile .-rep,
    .topbar-dialog .header h3,
    .topbar-dialog .header a,
    .topbar-dialog .header a:visited {
        color: #999;
        transition: background .3s, color .3s;
    }

    .so-header .navigation .-link:hover,
    .so-header .navigation .-link:focus,
    .so-header .my-profile:hover,
    .so-header .secondary-nav .-item .-link:hover,
    .so-header .secondary-nav .-item .-link:focus,
    .so-header .navigation .-item._current .-link {
        background-color: #555;
        color: #FFF;
    }

    .topbar-dialog .header {
        background-color: #444;
    }

    .topbar-dialog .header a:hover {
        color: #FFF;
    }
}

@-moz-document domain("meta.stackoverflow.com") {
    .so-header {
        background-color: #DDD;
    }
}