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It replaces colors around a color circle . Note that 0 degrees is red,
120 degrees is green and 240 is blue. If you're good at math, you could
calculate other color combinations using this formula (color 1 + color 2) / 2
e.g yellow = (green + red) / 2 = (120 + 0) / 2. Therefore, yellow is 60.
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# To rotate the color from 0 to 360deg.
filter: hue-rotate(angle);