improve color scheme

[AshishBagdane]

The new color scheme being used is more gentle on the eyes and gives a slight feeling of sci-fi u

x

[hatoo]

Sorry, we are sticking with Regular and High-Intensity colors in the ANSI color for compatibility.
However, the current color handling is not very good and can be refactored.
So, PR for refactoring or changing color schemes using restricted colors is very welcome.
Please make another PR if you go to this way.
Thank you!