hex : String -> Maybe Element.Color
hex "000000" -- Just (rgba 0 0 0 1)
hex "000000" -- Just (rgba 0 0 0 1)
hex "FFFFFF" -- Just (rgba 1 1 1 1)
hex "#FFFFFF" -- Just (rgba 1 1 1 1)
hex "FFF" -- Nothing
hexa : ( String, Basics.Float ) -> Maybe Element.Color
hexa ( "000000", 0 ) -- Just (rgba 0 0 0 0)
hexa ( "FFFFFF", 1 ) -- Just (rgba 1 1 1 1)
hexa ( "#FFFFFF", 0 ) -- Just (rgba 1 1 1 0)
hexa ( "FFFFFF", 10 ) -- Nothing
hexa ( "FFFFFF", -1 ) -- Nothing