Bug 568485 - [Dark theme] inherit background color for Canvas in editor

With this change the background color of an e3 editor follows the
background color of its container.

Change-Id: I07f73692b363c5b4aad13a30a8286f79276d785b
Signed-off-by: Lars Vogel <Lars.Vogel@vogella.com>
diff --git a/bundles/org.eclipse.ui.themes/css/dark/e4-dark_partstyle.css b/bundles/org.eclipse.ui.themes/css/dark/e4-dark_partstyle.css
index 6620c69..1344b27 100644
--- a/bundles/org.eclipse.ui.themes/css/dark/e4-dark_partstyle.css
+++ b/bundles/org.eclipse.ui.themes/css/dark/e4-dark_partstyle.css
@@ -129,12 +129,7 @@
 /* ------------------------------------------------------------- */
 
 #org-eclipse-e4-ui-compatibility-editor Canvas {
-    background-color: #262626;
-}
-
-#org-eclipse-e4-ui-compatibility-editor CTabItem {
-    color: #EEEEEE;
-    font-weight: normal;
+	background-color: inherit;
 }
 
 #org-eclipse-e4-ui-compatibility-editor LayoutCanvas {