Solarized theme for Slack (including background - not just sidebar)

slack-solarized-theme.css

#msgs_scroller_div::-webkit-scrollbar-track, #client_body::before, .client_container, 
#search_terms, #client_body, #footer, ts-message, .channel_header, ts-jumper ts-jumper-container,
ts-jumper input[type="text"] {
  background: #002B36 !important;
}

#client_body::before {
  border-bottom: 1px solid #268BD2 !important;
}

ts-message, .channel_title .channel_name, ts-jumper input[type="text"],
ts-jumper ol li .member_real_name, ts-jumper ol li .view_name, ts-jumper ol li .channel_name { 
  color: #93A1A1 !important;
}

.light_theme ts-message .message_content .message_sender, #msg_input::-webkit-input-placeholder,
ts-jumper input[type="text"]::-webkit-input-placeholder {
  color: #93A1A1 !important;
}

#msg_input, #primary_file_button {
  background: transparent !important;
  color: #93A1A1 !important;
  border-color: #073642 !important;
}

.day_divider .day_divider_label {
  color: #93A1A1 !important;
}

.day_container .day_msgs {
  border-top: 1px solid #268BD2 !important;
}

ts-message:hover, .day_divider .day_divider_label {
  background: #268BD2 !important;
}

#messages_container::after {
  background: none !important;
}

.bot_label { 
  padding: 0 4px !important;
  border-radius: 3px !important;
  background: #073642 !important;
}

From braden: After launching slack by doing

export SLACK_DEVELOPER_MENU=true
open -a /Applications/Slack.app

Open an inspector for your team, then paste this into the console..unfortunately i haven't found a good way to automate this yet.

const cssURI = 'https://gist.githubusercontent.com/anziem/806da8b104ae360d53bd46d5e5c90c4f/raw/adde403b6417568a59a5a73578a7565fe04458a3/slack-solarized-theme.css';

fetch(cssURI)
  .then(response => { 
    return response.text()  
  })
  .then(css => {
    let style = document.createElement('style')
    style.innerHTML = css

    document.body.appendChild(style)
  })

in a inspector in order to apply the theme to the team.

Tried that but no luck (no effect on the background). Possibly out of date and something changed in slack?
Any hints appreciated :)