RGB: Red - Green - Blue
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$r,g,b \in [0,1]$ - $R,G,B \in 0,1,2,...,255$:
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@Code \definecolor{blues}{rgb}{0.36, 0.54, 0.66}
@Code \definecolor{happyness}{RGB}{20,100,255}
@Code \textcolor{blues}{text}
@Code \pagecolor{happyness}