Add text-shadow rule.

src/CSS/Text/Shadow.purs

@@ -0,0 +1,33 @@
+module CSS.Text.Shadow where
+
+import CSS.Color (Color)
+import CSS.Common (class Inherit, class Initial, class None)
+import CSS.Property (class Val, value)
+import CSS.Size (Size)
+import CSS.String (fromString)
+import CSS.Stylesheet (CSS, key)
+import Data.Tuple.Nested (tuple4)
+
+data TextShadow a
+  = TextShadow (Size a) (Size a) (Size a) (Color)
+  | None
+  | Initial
+  | Inherit
+
+instance valTextShadow :: Val (TextShadow a) where
+  value (TextShadow h v b c) = value (tuple4 h v b c)
+  value (None) = fromString "none"
+  value (Initial) = fromString "initial"
+  value (Inherit) = fromString "inherit"
+
+instance noneTextShadow :: None (TextShadow a) where
+  none = None
+
+instance initialTextShadow :: Initial (TextShadow a) where
+  initial = Initial
+
+instance inheritTextShadow :: Inherit (TextShadow a) where
+  inherit = Inherit
+
+textShadow :: forall a. Size a -> Size a -> Size a -> Color -> CSS
+textShadow h v b c = key (fromString "text-shadow") (TextShadow h v b c)