HEX Value

In CSS, a color can be specified using a hexadecimal value in the form:

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#rrggbb

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Where rr (red), gg (green) and bb (blue) are hexadecimal values between 00 and ff (same as decimal 0-255).

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For example, #ff0000 is displayed as red, because red is set to its highest value (ff) and the others are set to the lowest value (00).

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Shades of gray are often defined using equal values for all the 3 light sources:

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