This extension changes the theme of Slack Web to a truly dark mode, including the messages pane, search pane, some settings etc.
As you know, Slack Web theme settings only lets you to change the colors of the sidebar. To reduce eye strain, I decided to write my first Chrome extension to change Slack Web app to a dark mode, mainly using the Ochin theme color.
This extension doesn't need any user interaction. Just install and it will work automatically when you open Slack web page.