linkedin-dark.user.css

/* ==UserStyle==
@name         LinkedIn Dark
@description  Dark theme for LinkedIn
@namespace    pblew.dark-themes
@version      1.0.3
@author       Paul Blew <paul.blew@gmail.com> (https://github.com/pblew/dark-themes)
@homepageURL  https://github.com/pblew/dark-themes
@supportURL   https://github.com/pblew/dark-themes/issues
@license      CC-BY-4.0
@preprocessor default
==/UserStyle== */

@-moz-document domain("linkedin.com") {
    html:not([stylus-iframe]) > body {
        background-color: black;
        filter: invert(90%) hue-rotate(180deg);
    }
    header#extended-nav,
    .msg-overlay-discoverability-color header.msg-overlay-bubble-header {
        background-color: #0077B5;
    }
    img,
    svg,
    .document-s-container > iframe,
    .feed-identity-module__member-bg-image,
    .feed-shared-linkedin-video,
    .video-js,
    .video-s-loader,
    .video-s-loader__overlay-text {
        filter: hue-rotate(180deg) invert(90%);
    }
    .feed-shared-linkedin-video img,
    .feed-shared-linkedin-video svg {
        filter: none;
    }
}