fixing heatmap axes

app.py

@@ -133,7 +133,9 @@ def plot_emotion_heatmap(heatmap_data):
         )
 
     # Format axis
+    ax.set_xticks(np.arange(len(heatmap_data.columns)) + 0.5)
     ax.set_xticklabels(heatmap_data.columns, rotation=0, ha='center')
+    ax.set_yticks(np.arange(len(heatmap_data.index)) + 0.5)
     ax.set_yticklabels(heatmap_data.index, rotation=0, ha='right')
 
     ax.set_xlabel("Sentences")