Skins: Improving the CSS styling

Bug 1168213: When you make your browser wide enough, on the
Default theme some white columns appear between the area colored
with the skin's View background and Body background.
This patch fills that area in with the View background.

Change-Id: I3fb5f40a64c9a7fd354395bee5d2ed4a87685e08

htdocs/theme/raw/templates/skin/style.tpl

@@ -81,7 +81,8 @@ a:active {
 #containerX #column-container,
 #container #column-container,
 #containerX #main-column-container,
-#container #main-column-container {
+#container #main-column-container,
+div#mainmiddlewrap {
     background: {$view_background_color} {$view_background_image|safe} {$view_background_repeat} {$view_background_attachment} {$view_background_position};
 }
 /** VIEW BLOCKTYPE CATEGORIES **/