diff --git a/demo/heatmap3.html b/demo/heatmap3.html
index fcab183..390d7a5 100644
--- a/demo/heatmap3.html
+++ b/demo/heatmap3.html
@@ -28,17 +28,17 @@
             y: 0
         },
         gradient: [{
-            color: [255, 255, 255, 0.0],
+            color: [0, 0, 0, 0.0],
             offset: 0
         }, {
-            color: [212, 225, 255, 1.0],
+            color: [0, 0, 255, 0.2],
             offset: 0.2
         }, {
-            color: [166, 255, 115, 1.0],
+            color: [0, 255, 0, 0.5],
             offset: 0.45
         }, {
             color: [255, 255, 0, 1.0],
-            offset: 0.75
+            offset: 0.85
         }, {
             color: [255, 0, 0, 1.0],
             offset: 1.0