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##Specifying colors
##color lighter darker transparent opaque
##You can use <color>+-<num> to have a color with different darkness; <color>,<num> to govern transparency. Use ++<color_spec> to overlay (mix) a color on an existing color. This can be made part of a style and then applying the style mixes the existing colors.
a, b;
--: Overall [fill.color = blue+50,
fill.gradient=up] {
a--b [fill.color=red]: solid;
a--b [fill.color=red,128]: transparent;
a--b [fill.color=red-50]: dark red;
a--b [fill.color=red+50]: light red;
a--b [fill.color=none]: none;
defstyle arrow [line.color=red,
arrow.color=green,
text.color=blue];
a->b: Unmodified;
a->b: Yellow overcast [color=++yellow,150];
defstyle overcast [line.color=++yellow,150,
arrow.color=++yellow,150,
text.color=++yellow,150];
a->b: Yellow overcast [overcast];
};
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