A custom, Tkinter Style Handler for widgets. Allows the use of a minimalistic, CSS-like structure that can be easily applied to any TK widgets (does not work for TTK widgets).
This also supports inheritance between styles and applying multiple styles to a single widget.
TTKs style handling exists but has flaws. A major one being that it doesn't function as expected: https://stackoverflow.com/questions/17635905/ttk-entry-background-colour