In W3.CSS, colors are based mainly on which system?

A. RGB

B. HЕX

C. Material Design colors

D. CMYK

Correct Answer is :

C. Material Design colors

Explanation

W3.CSS includes a built-in color library that is primarily based on Google's Material Design color palette.
It provides predefined color classes such as:

•  w3-red
• w3-blue
• w3-green
• w3-indigo
• w3-teal