Went with just making the left gui frame monochrome to sort out its value structure compared to the scene.

gui.cpp

@@ -222,12 +222,11 @@ namespace gui {
   void FSM::draw_gui() {
     sf::RectangleShape rect({SCREEN_WIDTH - RAY_VIEW_WIDTH, SCREEN_HEIGHT});
     rect.setPosition({0,0});
-    rect.setFillColor({36, 33, 26});
+    rect.setFillColor({30, 30, 30});
     $window.draw(rect);
 
     auto left_gui = $textures.sprite_textures.at("left_gui").sprite;
     left_gui->setPosition({0,0});
-    left_gui->setColor({150, 150, 150});
     $window.draw(*left_gui);
 
     sf::RectangleShape lower({RAY_VIEW_WIDTH, SCREEN_HEIGHT - RAY_VIEW_HEIGHT});