[Popup] Use @background value for arrow background color
@ -43,7 +43,7 @@
@border: @borderWidth solid @borderColor;
/* Arrow */
@arrowBackground: @white;
@arrowBackground: @background;
@arrowZIndex: 2;
@arrowJitter: 0.05em;
@arrowOffset: -(@arrowSize / 2) + @arrowJitter;