diff --git a/v2/internal/appoptions/default.go b/v2/internal/appoptions/default.go
index d7753307..1c0d17b4 100644
--- a/v2/internal/appoptions/default.go
+++ b/v2/internal/appoptions/default.go
@@ -6,4 +6,5 @@ var Default = &Options{
 	Width:    1024,
 	Height:   768,
 	DevTools: true,
+	Colour:   0xFFFFFFFF,
 }
diff --git a/v2/internal/appoptions/options.go b/v2/internal/appoptions/options.go
index 4105578c..068ac516 100644
--- a/v2/internal/appoptions/options.go
+++ b/v2/internal/appoptions/options.go
@@ -14,6 +14,7 @@ type Options struct {
 	MaxHeight     int
 	StartHidden   bool
 	DevTools      bool
+	Colour        int
 	Mac           MacOptions
 }
 
diff --git a/v2/internal/ffenestri/ffenestri.go b/v2/internal/ffenestri/ffenestri.go
index f355e098..a448e7ce 100644
--- a/v2/internal/ffenestri/ffenestri.go
+++ b/v2/internal/ffenestri/ffenestri.go
@@ -126,6 +126,14 @@ type DispatchClient interface {
 	SendMessage(string)
 }
 
+func intToColour(colour int) (C.int, C.int, C.int, C.int) {
+	var alpha = C.int(colour & 0xFF)
+	var blue = C.int((colour >> 8) & 0xFF)
+	var green = C.int((colour >> 16) & 0xFF)
+	var red = C.int((colour >> 24) & 0xFF)
+	return red, green, blue, alpha
+}
+
 // Run the application
 func (a *Application) Run(incomingDispatcher Dispatcher, bindings string) error {
 	title := a.string2CString(a.config.Title)
@@ -158,6 +166,11 @@ func (a *Application) Run(incomingDispatcher Dispatcher, bindings string) error
 		C.DisableFrame(a.app)
 	}
 
+	if a.config.Colour != 0 {
+		r, b, g, alpha := intToColour(a.config.Colour)
+		C.SetColour(a.app, r, g, b, alpha)
+	}
+
 	// Escape bindings so C doesn't freak out
 	bindings = strings.ReplaceAll(bindings, `"`, `\"`)
 
diff --git a/v2/internal/ffenestri/ffenestri.h b/v2/internal/ffenestri/ffenestri.h
index e7f15326..da50b0d5 100644
--- a/v2/internal/ffenestri/ffenestri.h
+++ b/v2/internal/ffenestri/ffenestri.h
@@ -20,6 +20,7 @@ extern void ToggleMaximise(void *app);
 extern void Minimise(void *app);
 extern void Unminimise(void *app);
 extern void ToggleMinimise(void *app);
+extern void SetColour(void *app, int red, int green, int blue, int alpha);
 extern void SetSize(void *app, int width, int height);
 extern void SetPosition(void *app, int x, int y);
 extern void Quit(void *app);
@@ -27,7 +28,6 @@ extern void SetTitle(void *app, const char *title);
 extern void Fullscreen(void *app);
 extern void UnFullscreen(void *app);
 extern void ToggleFullscreen(void *app);
-extern int SetColour(void *app, const char *colourString);
 extern void DisableFrame(void *app);
 extern char *SaveFileDialog(void *appPointer, char *title, char *filter);
 extern char *OpenFileDialog(void *appPointer, char *title, char *filter);
diff --git a/v2/internal/ffenestri/ffenestri_client.go b/v2/internal/ffenestri/ffenestri_client.go
index 5465865e..7af51d87 100644
--- a/v2/internal/ffenestri/ffenestri_client.go
+++ b/v2/internal/ffenestri/ffenestri_client.go
@@ -114,9 +114,9 @@ func (c *Client) WindowSize(width int, height int) {
 }
 
 // WindowSetColour sets the window colour
-func (c *Client) WindowSetColour(colour string) bool {
-	result := C.SetColour(c.app.app, c.app.string2CString(colour))
-	return result == 1
+func (c *Client) WindowSetColour(colour int) {
+	r, b, g, a := intToColour(colour)
+	C.SetColour(c.app.app, r, g, b, a)
 }
 
 // OpenFileDialog will open a file dialog with the given title
diff --git a/v2/internal/ffenestri/ffenestri_darwin.c b/v2/internal/ffenestri/ffenestri_darwin.c
index e50fbcac..526c7e61 100644
--- a/v2/internal/ffenestri/ffenestri_darwin.c
+++ b/v2/internal/ffenestri/ffenestri_darwin.c
@@ -7,7 +7,6 @@
 
 // Macros to make it slightly more sane
 #define msg objc_msgSend
-#define msg_stret objc_msgSend_stret
 
 #define c(str) (id)objc_getClass(str)
 #define s(str) sel_registerName(str)
@@ -108,6 +107,10 @@ struct Application {
     int resizable;
     int devtools;
     int fullscreen;
+    int red;
+    int green;
+    int blue;
+    int alpha;
 
     // Features
     int frame;
@@ -155,6 +158,13 @@ void UseToolbar(struct Application *app) {
     app->useToolBar = 1;
 }
 
+void SetColour(struct Application *app, int red, int green, int blue, int alpha) {
+    app->red = red;
+    app->green = green;
+    app->blue = blue;
+    app->alpha = alpha;
+}
+
 void FullSizeContent(struct Application *app) {
     app->fullSizeContent = 1;
 }
@@ -482,23 +492,6 @@ char* OpenDirectoryDialog(void *appPointer, char *title) {
     return foldername;
 }
 
-  // SetColour sets the colour of the webview to the given colour string
-int SetColour(void *appPointer, const char *colourString) {
-    Debug("SetColour Called with: %s", colourString);
-
-    // struct Application *app = (struct Application*) appPointer;
-    // GdkRGBA rgba;
-    // gboolean result = gdk_rgba_parse(&rgba, colourString);
-    // if (result == FALSE) {
-    //     return 0;
-    // }
-    // Debug("Setting webview colour to: %s", colourString);
-    // webkit_web_view_get_background_color((WebKitWebView*)(app->webView), &rgba);
-    // int c = NS_RGBA(1, 0, 0, 0.5);
-
-    return 1;
-}
-
 const char *invoke = "window.external={invoke:function(x){window.webkit.messageHandlers.external.postMessage(x);}};";
 
 // DisableFrame disables the window frame
@@ -693,7 +686,6 @@ void Run(void *applicationPointer, int argc, char **argv) {
     }
 
     if( app->fullSizeContent || app->frame == 0) {
-        Debug("FULLSIZECONTENTT!!!!!!");
         decorations |= NSWindowStyleMaskFullSizeContentView;
     }
 
@@ -733,6 +725,14 @@ void Run(void *applicationPointer, int argc, char **argv) {
 
     // Set Style Mask
     msg(mainWindow, s("setStyleMask:"), decorations);
+
+    // Set Colour
+    id colour = msg(c("NSColor"), s("colorWithCalibratedRed:green:blue:alpha:"),
+                          (float)app->red / 255.0, 
+                          (float)app->green / 255.0, 
+                          (float)app->blue / 255.0,
+                          (float)app->alpha / 255.0);
+    msg(mainWindow, s("setBackgroundColor:"), colour);
     
 
     // Setup webview
diff --git a/v2/internal/messagedispatcher/dispatchclient.go b/v2/internal/messagedispatcher/dispatchclient.go
index 58097e7a..7f41968f 100644
--- a/v2/internal/messagedispatcher/dispatchclient.go
+++ b/v2/internal/messagedispatcher/dispatchclient.go
@@ -28,7 +28,7 @@ type Client interface {
 	WindowSize(width int, height int)
 	WindowFullscreen()
 	WindowUnFullscreen()
-	WindowSetColour(colour string) bool
+	WindowSetColour(colour int)
 }
 
 // DispatchClient is what the frontends use to interface with the
diff --git a/v2/internal/messagedispatcher/messagedispatcher.go b/v2/internal/messagedispatcher/messagedispatcher.go
index 5787a472..3ed5ef82 100644
--- a/v2/internal/messagedispatcher/messagedispatcher.go
+++ b/v2/internal/messagedispatcher/messagedispatcher.go
@@ -231,7 +231,7 @@ func (d *Dispatcher) processWindowMessage(result *servicebus.Message) {
 			client.frontend.WindowUnFullscreen()
 		}
 	case "setcolour":
-		colour, ok := result.Data().(string)
+		colour, ok := result.Data().(int)
 		if !ok {
 			d.logger.Error("Invalid colour for 'window:setcolour' : %#v", result.Data())
 			return
diff --git a/v2/internal/webserver/websockets.go b/v2/internal/webserver/websockets.go
index 004d2315..bb221a2b 100644
--- a/v2/internal/webserver/websockets.go
+++ b/v2/internal/webserver/websockets.go
@@ -59,8 +59,7 @@ func (wc *WebClient) WindowFullscreen() {}
 func (wc *WebClient) WindowUnFullscreen() {}
 
 // WindowSetColour is a noop in the webclient
-func (wc *WebClient) WindowSetColour(colour string) bool {
-	return false
+func (wc *WebClient) WindowSetColour(colour int) {
 }
 
 // Run processes messages from the remote webclient
diff --git a/v2/test/runtime/main.go b/v2/test/runtime/main.go
index 8645b2d9..e65d0df4 100644
--- a/v2/test/runtime/main.go
+++ b/v2/test/runtime/main.go
@@ -20,11 +20,12 @@ func main() {
 		Height:        620,
 		DisableResize: false,
 		Fullscreen:    false,
+		Colour:        0xFF000088,
 		Mac: wails.MacOptions{
-			HideTitle:                  true,
+			HideTitle:                  false,
 			HideTitleBar:               false,
-			TitlebarAppearsTransparent: false,
-			FullSizeContent:            true,
+			TitlebarAppearsTransparent: true,
+			FullSizeContent:            false,
 			UseToolbar:                 true,
 			HideToolbarSeparator:       true,
 		},