Update app.py

app.py

@@ -77,7 +77,7 @@ def find_midi(search_string, search_options):
     
     colors = ['red', 'yellow', 'green', 'cyan',
             'blue', 'pink', 'orange', 'purple',
-            'gray', 'black', 'gold', 'silver',
+            'gray', 'white', 'gold', 'silver',
             'lightgreen', 'indigo', 'maroon', 'turquoise']
     
     for s in single_track_score_notes:
@@ -88,7 +88,7 @@ def find_midi(search_string, search_options):
     plt.close()
     plt.figure(figsize=(14,5))
     ax=plt.axes(title=title)
-    ax.set_facecolor('white')
+    ax.set_facecolor('black')
     
     plt.scatter(x,y, s=2, c=c)
     plt.xlabel("Time in MIDI ticks")