Attached is a ZIP archive with the four files you need to add Bookface Light and Bookface Dark as customization options for the "Frio" theme on your Friendica server. Unlike the browser user stylesheets these will adopt the Accent Color setting.

Many thanks to @Matthias for giving me some clue how to do this! Once I installed Friendica on my development server their adaptation of my stylesheet to a theme template helped me figure it out.

Work-In-Progress. Use it in production at your own risk!

I'm sure I've missed some things because I've been adding styles as I encounter things that look like they need some attention, I don't know what content/features many add-ons create might look like. You will notice that there are many, many "!important" declarations in the CSS, which are necessary for a browser user stylesheet client-side. They probably aren't all necessary in a template/scheme server-side, but I didn't go through the code and remove any of them.

Changes from V4 of my user stylesheet:

• Top Bar button placement fixed for phones with small screens (down to 320px wide)
• Border radius on Compose Title input normalized to match the rest of the Compose inputs.
• Found and fixed some form inputs with wrongly colored backgrounds.
• Fixed position of Delegate Settings "Save" button to match all other "Submit" settings.

Instructions for use are in the included README file.

DOWNLOAD BOOKFACE FILES: