fix syntax

app.py

@@ -106,7 +106,7 @@ for i in range(len(gene_ids)):
         "position": {
             "x" : i * 10,
             "y" : i * 10}})
-for i in neighbors.shape()[0]:
+for i in len(neighbors.index):
     edge = neigbors.iloc[i]
     network_data.append({
         "data" : {
@@ -126,7 +126,7 @@ with col3:
 ##########################################################
 
 stylesheet = [
-    {"selector": "node", "style": {"width": 20, "height": 20, "shape": "rectangle"}},
+    {"selector": "node", "style": {"width": 50, "height": 20, "shape": "rectangle"}},
     {"selector": "edge", "style": {"width": 10}},
 ]