change default brush color

app.py

@@ -7,7 +7,7 @@ with gr.Blocks() as app:
     recog = Recognizer("model/model.xml", "model/char_list.txt")
 
     with gr.Row():
-        brush = gr.Brush(default_color="#000", default_size=15)
+        brush = gr.Brush(default_color="#FFF", default_size=15)
         sketch = gr.Sketchpad("bg.png", type="numpy", brush=brush, layers=False)
         result = gr.TextArea()
     check = gr.Button()