How to use my own custome colors and background color

[kobygold]

Hi guys,
I'm sure this is basic, but I couldn't find that on the documentation:
How can I use my own custom colors and background color for the output html?
I would like to set all colors (red, green, blue, etc.) to my desired colors as hex value, as well as the background color.
I couldn't find the way to do that.
I saw only predefined color schemes, and background as dark/not-dark (but not specific color).
Again, I'm sure that's basic, but couldn't find how to do that on the docs here:
https://ansi2html.readthedocs.io/
or here:
https://pypi.org/project/ansi2html/

Thanks,
Koby