Halo! I've tried to change color scheme using the following project https://github.com/chriskempson/base16-shell. But I didn't get a success. It seems like the colors are hardcoded at config.def.h and can not be changed then. Unfortunately, I don't know well internals of the st nor the terminal emulators in general so I hope to get a hint. Thank you all.
Regards, Timur Fayzrakhmanov