Change sizes in rectangles

utils.py

@@ -156,11 +156,11 @@ def sequence_to_pandas_dataframe(sequence):
 def dataframe_to_pianoroll_img(df):
     fig = plt.figure(figsize=(8, 5))
     ax = fig.add_subplot(111)
-    ax.scatter(df.start_time, df.pitch, c="black")
+    ax.scatter(df.start_time, df.pitch, c="white")
     for _, row in df.iterrows():
         ax.add_patch(Rectangle(
             (row["start_time"], row["pitch"]), 
-            row["duration"], 0.4, color="white"
+            row["duration"], 0.01, color="white"
         ))
     plt.xlabel('Seconds', fontsize=18)
     plt.ylabel('MIDI pitch', fontsize=16)