Minor changes

app.py

@@ -317,7 +317,7 @@ def visualize_structure(pil_img, structure_result):
     for class_name in structure_class_names[:-1]:
         color, alpha, linewidth, hatch = get_bbox_decorations('recognition', structure_class_map[class_name])
         legend_elements.append(
-            Patch(facecolor=color, edgecolor=color, linestyle='--', label=class_name, hatch=hatch)
+            Patch(facecolor='none', edgecolor=color, linestyle='--', label=class_name, hatch=hatch)
         )
 
     plt.legend(handles=legend_elements, bbox_to_anchor=(0.5, -0.02), loc='upper center', borderaxespad=0,
@@ -586,7 +586,7 @@ def cells_to_excel(cells, file_path):
 
 
 def main():
-    
+
     st.title('Table Extraction Demo')
 
     filename = st.file_uploader('Upload image', type=['png', 'jpeg', 'jpg'])