Slack dark theme injector tool

This tool writes a dark theme to the Slack desktop application. Dark theme was taken from the generated Dark Reader theme that was applied when I visited the web version of slack, like so:

Array.from(document.querySelectorAll('.darkreader')).map((n) => n.textContent).join('\n');

Sample screenshot:

Prerequisites

Install python

You really should take the css file from this site, and host it somewhere you control. It's not a great idea to have a script inject an arbitrary CSS file from a domain outside of your control, into an application like Slack that could have sensitive data.

Don't trust me - fork the repo.

Running

Unix

sudo python makeitdark.py

sudo python3 makeitdark.py

Windows

python makeitdark.py

Sidebar

Add this sidebar theme for consistency which kinda makes it look like Mojave dark mode, from slackthemes.net:

#333336,#2e2e31,#666668,#ffffff,#277df6,#d7d5d4,#277df6,#277df6

Reverting

If you want to uninstall the dark Slack theme you can run with the makeitlight option:

makeitdark.py makeitlight

Slack Updates

When Slack updates it will overwrite the installed dark theme. When this happens just re-run the tool to make it dark again.