I highly recommend the Chrome addon Stylus. It is a fork of the older extension Stylish, but without any of the tracking or analytics. If you install the extension, you can simply visit this site and click the icon in the top right of Chrome, then click “find styles” and my style should pop up. Alternatively, you can go to userstyles.org and click “Install Style” on that page.
I welcome anyone to make modifications to this, I’m not great with colors. But I tried to follow the design of the original forum (IE this color is darker than the other color which is darker than the other color) just translated to shades of grey. It is certainly a work in progress. Main thing is probably dealing with the reply/new post editor and other form inputs/buttons.