diff --git a/as1/as1.cpp b/as1/as1.cpp
index 064a643..361bad4 100644
--- a/as1/as1.cpp
+++ b/as1/as1.cpp
@@ -1,10 +1,12 @@
 #include "AudioDevice.hpp"
 #include "Color.hpp"
+#include "raylib.h"
 #include <raylib-cpp.hpp>
 #include <functional>
 #include <iostream>
 
 static std::function<void()> pingButtonHandler;
+static bool darkMode = false;
 
 void PingButton() {
     pingButtonHandler();
@@ -43,7 +45,16 @@ int main() {
 
         GuiVolumeControl(&guiState);
 
-        window.ClearBackground(raylib::Color::RayWhite());
+        const char *modeText = darkMode ? "Background: Black" : "Background: White";
+        if (GuiButton((Rectangle){ 24, 328, 256, 24 }, modeText)) {
+            darkMode = !darkMode;
+        }
+
+        if (darkMode) {
+            window.ClearBackground(raylib::Color::Black());
+        } else {
+            window.ClearBackground(raylib::Color::RayWhite());
+        }
 
         ping.SetVolume(guiState.SFXSliderValue / 100.0f);