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3.1: CSS colours - Coggle Diagram

- - - - https://en.wikipedia.org/wiki/Pixel_geometry
      - 3 different colours
        
        red, green, blue
- - - - represented by a hex number
        
        base 16
        
        values 0-15
        
        0123456789ABCDEF
        
        makes the numbers shorter
      - six numbers
        
        three pairs
        
        two hex digits have a maximum value of
        
        15 + (15 x16)
        
        255
        
        red, green, blue
  - - - contains a duplicate digit pair
    - - #000000
        
        becomes
        
        #000
      - #cc55ee
        
        becomes
        
        #c5e