RGBThe rgb(), rgba(), and hexadecimal (as in #004488ff) notations pick colors using red, green, blue, and alpha (transparency) channels.color-typesColor typeswidely2020-01-152022-07-15https://drafts.csswg.org/css-color-4/#rgb-functionshttps://developer.mozilla.org/docs/Web/CSS/Reference/Values/color_value/rgbcss.types.color.rgbcss.types.color.rgb.alpha_parametercss.types.color.rgb.float_valuescss.types.color.rgb.mixed_type_parameterscss.types.color.rgb.space_separated_parameterscss.types.color.rgb_hexadecimal_notationcss.types.color.rgb_hexadecimal_notation.alpha_hexadecimal_notationhttps://nowyoucanuse.com/features--rgb.html