gistfile1.txt

/**
 * add this code to the file ssb-interop.js
 * you can find it by going to Applications -> Slack 
 * -> right click "show package content" -> /Applications/Slack.app/Contents/Resources/app.asar.unpacked/src/static
 */
document.addEventListener('DOMContentLoaded', function() {

    let tt__customCss = `
    body,
    .channel_header,
    # footer,
    .channel_title_info,
    # channel_topic_text {
        background: rgb(0, 43, 54);
    }
    .c - message__body {
        color: rgb(153, 174, 177);
    }
    # team_menu,
    .p - channel_sidebar {
        background: #023f4e !important; }
        .c-presence--active {color: rgb(177, 202, 17) !important;}
        nav.p-channel_sidebar .p-channel_sidebar__channel--selected, .p-channel_sidebar__link--selected, .c-message_list__day_divider__label__pill, .p-message_pane .c-message_list.c-virtual_list--scrollbar > .c-scrollbar__hider:before { color: # eee!important;background: rgb(27, 139, 210) !important;
    }
    .c - message_list__day_divider__line {
        border - top - color: rgb(27, 139, 210) !important
    }
    # msg_input,
    # primary_file_button {
        background: rgb(2, 55, 68) !important;
    }
    # msg_form # msg_input {
        border - color: transparent;
    }
    `;
    $.ajax({
        url: 'https://cdn.rawgit.com/laCour/slack-night-mode/master/css/raw/black.css',
        success: function(css) {
            $('<style></style>').appendTo('head').html(css + tt__customCss);
        }
    });

    console.log("Erez");
});