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Predicate theme_base/2
 prolog:theme_base(?Theme, ?Base) is nondet[multifile, library(ansi_term)]
Hook that makes Theme a variation of the theme Base. If Theme does not define the colours of a class (prolog:console_color/3), those of Base are used, and so on. The same applies to the styles of the online help and the theme colours of the development tools. The theme file of Theme must load the theme file of Base, e.g. 
:- module(prolog_theme_my_dark, []).
:- use_module(library(theme/dark)).
:- multifile prolog:theme/1, prolog:theme_base/2.

prolog:theme(my_dark).
prolog:theme_base(my_dark, dark).
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