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CSS colors can be specified as:

• Hex colors must be #rgb or #rrggbb using only the hex digits 0-9 and A-F
• RGB() colors must be three integers (0-255) or three percentages
• RGBA() colors must be three integers (0-255) or three percentages, followed by an alpha value between 0.0 and 1.0
• HSL() colors must be a number (or angle) followed by two percentages
• HSLA() colors must be a number (or angle) followed by two percentages and an alpha value between 0.0 and 1.0
• Named colors must use one of the 150 named CSS colors (black, white, red...)