Update app.py

app.py

@@ -410,7 +410,7 @@ app.layout = html.Div([
     html.Div([
         html.Div([
             html.Label("選擇股票:"),
-            dcc.Dropdown(id='stock-dropdown', options=[{'label': name, 'value': symbol} for name, symbol in TAIWAN_STOCKS.items()], value='2330.TW', style={'margin-bottom': '10px'})
+            dcc.Dropdown(id='stock-dropdown', options=[{'label': name, 'value': symbol} for name, symbol in TAIWAN_STOCKS.items()], value='0050.TW', style={'margin-bottom': '10px'})
         ], style={'width': '30%', 'display': 'inline-block', 'vertical-align': 'top'}),
         html.Div([
             html.Label("時間範圍:"),