Clean up example button widgets

@@ -112,6 +112,7 @@ class SwitchCameraButton extends StatelessWidget {
         }
 
         return IconButton(
+          color: Colors.white,
           iconSize: 32.0,
           icon: icon,
           onPressed: () async {
@@ -166,10 +167,13 @@ class ToggleFlashlightButton extends StatelessWidget {
               },
             );
           case TorchState.unavailable:
-            return const Icon(
+            return const SizedBox(
+                width: 48.0,
+                child: Icon(
                   Icons.no_flash,
+                  size: 32.0,
                   color: Colors.grey,
-            );
+                ));
         }
       },
     );