1 files changed, 7 insertions, 11 deletions
diff --git a/src/main/scala/reading/component/style/Color.scala b/src/main/scala/reading/component/style/Color.scala
index 1f44eb5..ed2041f 100644
--- a/src/main/scala/reading/component/style/Color.scala
+++ b/src/main/scala/reading/component/style/Color.scala
@@ -7,19 +7,14 @@ import scalacss.internal.{ ValueT, Color => ScalaCssColor }
 case class Color(red: Int, green: Int, blue: Int, alpha: Double = 1.0) {
   val value: ValueT[ValueT.Color] = ScalaCssColor.rgba(red, green, blue, alpha)
 
-  def lighten(n: Int): Color =
-    Color(
-      red = Color.bound(red + n),
-      green = Color.bound(green + n),
-      blue = Color.bound(blue + n),
-      alpha = alpha
-    )
+  def lighten(pct: Int): Color = ratio(1.0 + pct / 100.0)
+  def darken(pct: Int): Color = ratio(1.0 - pct / 100.0)
 
-  def darken(n: Int): Color =
+  private def ratio(r: Double): Color =
     Color(
-      red = Color.bound(red - n),
-      green = Color.bound(green - n),
-      blue = Color.bound(blue - n),
+      red = Color.bound(red * r),
+      green = Color.bound(green * r),
+      blue = Color.bound(blue * r),
       alpha = alpha
     )
 }
@@ -44,4 +39,5 @@ object Color {
     )
 
   def bound(n: Int): Int = Math.max(0, Math.min(255, n))
+  def bound(d: Double): Int = bound(d.toInt)
 }