A unique feature of tw-themes is the ability to invert your color shades at run-time.
When you do this your light shades become dark and your dark shades become light. This has the effect of doubling the number of available color themes.
You can choose to use this feature or simply let sleeping dogs lie (i.e. leave it alone).
The interesting aspect of this feature is it has the potential of supporting an automated dark mode, depending on how your color philosophy is implemented.
Please Note that only tailwind colors support shade inversion. Custom colors will simply no-op on shade inversion requests. Future Consideration: Custom Color Shade Inversion