TCDICORE-175 changes to color gradient

Author: dynamodenis

forms/src/main/java/org/devgateway/toolkit/forms/wicket/styles/BaseStyles.css

@@ -398,10 +398,18 @@ button .btn-home-label {
 }
 
 /*-----------------Color picker --------------------*/
+
 .colorpicker-saturation {
     background:
-            linear-gradient(to bottom right, rgba(255, 255, 255, 0), rgba(0, 0, 0, 1)),
-            linear-gradient(to top right, rgba(255, 255, 255, 0), rgba(255, 255, 255, 1));
+            linear-gradient(to right,
+            rgba(255, 255, 255, 1),
+            rgba(255, 0, 0, 1)
+            ),
+            linear-gradient(to bottom,
+            rgba(0, 0, 0, 0),
+            rgba(0, 0, 0, 1)
+            );
+    background-blend-mode: multiply;
 }
 
 .colorpicker-hue {