Add initial unselected tab outline color
diff --git a/platform/org.eclipse.platform/css/e4_basestyle.css b/platform/org.eclipse.platform/css/e4_basestyle.css
index a7a9d46..8530ab3 100644
--- a/platform/org.eclipse.platform/css/e4_basestyle.css
+++ b/platform/org.eclipse.platform/css/e4_basestyle.css
@@ -12,6 +12,7 @@
     outer-keyline-color: #FFFFFF;
 	inner-keyline-color: #FFFFFF;
 	padding: 0px 9px 10px;
+	tab-outline: #B6BCCC;
 }
 
 .MPartStack.active {