Merge pull request #6059 from devsli/patch-1

[Popup] Use @background value for arrow background color

Author: jlukic

src/themes/default/modules/popup.variables

@@ -43,7 +43,7 @@
 @border: @borderWidth solid @borderColor;
 
 /* Arrow */
-@arrowBackground: @white;
+@arrowBackground: @background;
 @arrowZIndex: 2;
 @arrowJitter: 0.05em;
 @arrowOffset: -(@arrowSize / 2) + @arrowJitter;