1 files changed, 21 insertions, 1 deletions
diff --git a/frontends/cocoa/ArrowBox.m b/frontends/cocoa/ArrowBox.m
index 258a58cda..6d6911d9b 100644
--- a/frontends/cocoa/ArrowBox.m
+++ b/frontends/cocoa/ArrowBox.m
@@ -23,6 +23,15 @@
 
 #import "ArrowBox.h"
 
+#import "desktop/system_colour.h"
+#import "cocoa/plotter.h"
+
+@interface ArrowBox ()
+
+@property (nonatomic) NSColor *backgroundColor;
+
+@end
+
 @implementation ArrowBox
 
 @synthesize arrowPosition;
@@ -30,6 +39,17 @@
 @synthesize arrowEdge;
 @synthesize cornerRadius;
 
+- (NSColor *)backgroundColor {
+    if (!_backgroundColor) {
+        colour fill_colour;
+        nserror res = ns_system_colour_char("Window", &fill_colour);
+        NSAssert(res == NSERROR_OK, @"Expect to find the window colour");
+        _backgroundColor = cocoa_convert_colour(fill_colour);
+    }
+
+    return _backgroundColor;
+}
+
 - (void)setArrowEdge:(ArrowEdge)newEdge
 {
     if (arrowEdge == newEdge) {
@@ -140,7 +160,7 @@
     [path closePath];
 
     [[NSColor colorWithDeviceWhite:1.0 alpha:0.4] set];
-    [[NSColor colorWithDeviceWhite:0.0 alpha:0.75] setFill];
+    [self.backgroundColor setFill];
 
     NSAffineTransform *transform = [NSAffineTransform transform];
     [transform translateXBy:bounds.origin.x yBy:bounds.origin.y];