tune style

app.py

@@ -164,14 +164,18 @@ with col3:
 
 stylesheet = [
     {"selector": "node", "style": {
-        "width": 200,
-        "height": 75,
+        "width": 100,
+        "height": 50,
         "shape": "rectangle",
         "label" : "data(label)",
         "labelFontSize": 100,
-        'background-color': '#399AF9'
+        'background-color': '#399AF9',
+        "text-halign": "center",
+        "text-valign": "center",
     }},
-    {"selector": "edge", "style": {"width": 10}}
+    {"selector": "edge", "style": {
+        "width": "data(label)"
+    }}
 ]
 
 st.title("ToxoCEN Network")