Colour - LiruJ/GuiCookie GitHub Wiki
Colours allow raw strings to be parsed into MonoGame colours which can then be used to colour and tint graphics. Note that the British spelling "Colour" must be used in XML, as alternative spellings has not been implemented yet.
<Node Colour="*255, 0, 126"/>
<Node Colour="*255, 0, 126, 240"/>Starting the string with the * character reads the string as an RGB colour with an optional alpha, separated by the , character.
<Node Colour="#f2a"/>
<Node Colour="#f2a5"/>
<Node Colour="#ffccff"/>
<Node Colour="#ffccff77"/>Starting the string with the # character reads the string as a hex colour with an optional alpha.
<Node Colour="$PlayButton"/>Starting the string with the $ character attempts to find the colour resource with that name. This can be used to define a single colour scheme in a single place, which is then referenced by every style.
See Colour Resource.
<Node Colour="CornflowerBlue"/>
<Node Colour="LawnGreen"/>
<Node Colour="darkorange"/>If the string does not start with a *, #, or $ character, GuiCookie will attempt to read it as a MonoGame colour, not case sensitive.