How about we also add a new version of
<https://srfi.schemers.org/srfi.css>, like
<https://srfi.schemers.org/srfi-with-dark-mode.css>, that would be a
good default CSS with automatic dark mode. Then the SRFI template could
be updated with this new CSS for upcoming SRFIs.

I'm not a dark-mode theme user, but the colors are pretty harsh. The
green, dark purple, grey, and blue need to be changed to something else.
I'm not sure what though, that would require more fiddling. (I'm not an
interior designer, or a painter.)

I made a pull request with some small changes to the admin.css which
looks better in my Firefox:

https://github.com/scheme-requests-for-implementation/srfi-common/pull/79

-- Peter McGoron