There are 2 repositories under stylebot topic.
Google Chat Dark Theme. This is a scratch but still good enough dark theme for google chat for daily use.
This was created to help fix some of the nightmare that TNT created during their forced release of the 2020 site redesign.
Stylebot CSS file to enable Dark Mode
CSS code for the stylebot plugin (https://stylebot.dev/) modifying https://multistre.am/, auto-hide sidebar, decrease the overlaypopup responsiveness. The sidebar no longer wasted screen real estate. The sidebar no longer takes up your precious space, giving you more room to view streaming streams.