Update app.py

app.py

@@ -84,7 +84,7 @@ def plot_price_with_cones(data, bootstrap_percentiles, days, thresholds, bootstr
     fig = go.Figure()
 
     # Plot historical prices
-    fig.add_trace(go.Scatter(x=data.index, y=data, mode='lines', name='Historical Prices', line=dict(color='black')))
+    fig.add_trace(go.Scatter(x=data.index, y=data, mode='lines', name='Historical Prices', line=dict(color='white')))
 
     # Plot bootstrapping simulation cone
     fig.add_trace(go.Scatter(x=future_dates, y=bootstrap_percentiles[2], mode='lines', name='Bootstrap Median', line=dict(color='red', dash='dash')))