/app/index.styl:14:5
10| // require a color
11|
12| require-color(color)
13| unless color is a 'color'
14| error('RGB or HSL value expected, got a ' + -string(color))
-----------^
15|
16| // require a unit
17|
RGB or HSL value expected, got a ident $color--white
at "body" (stylus:2:1)