"hexadecimal" meaning?

Question

hexadecimal

Answer 1

Hexadecimal color values are also supported in all browsers.

A hexadecimal color is specified with: #RRGGBB.

RR (red), GG (green) and BB (blue) are hexadecimal integers between 00 and FF specifying the intensity of the color.

For example, #0000FF is displayed as blue, because the blue component is set to its highest value (FF) and the others are set to 00.

https://www.w3schools.com/colors/colors_hexadecimal.asp

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Answer 2

Hexadecimal means base 16, so you've got these characters: 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, A, B, C, D, E, F, with 0 being the smallest and F being the biggest.