Installation: Preferences/General, then select darktable-elegant-darker and paste the CSS into the tweaks box. (make sure to have a backup of your previous CSS tweaks, just in case)
Comments/suggestions for further improvements are very welcome.
Darktable should never crash regardless of any CSS changes. Please report the crash as GitHub issue and include as much information about your specific setup as possible - OS, dt version, gtk version, other libraries and their versions, debug logs from the crash, possibly with core dumps.
If you determine the cause of the crash, please feel free to send an update.
Thanks, BeF for the post. It is definitely helping my tired old eyes. One suggestion - Do you think you could change the font colour for the radio buttons? They are currently white on a grey background. That is a bit of a strain. Here is an example of it.
Thank you for the suggestion.
Have you tried setting the theme to darktable-elegant-darker as I did? My version - see above - looks slightly different with light gray font on dark buttons.