Reduced spring length, decreased node border width, and changed node border color.

public/app.js

@@ -177,7 +177,7 @@ const options = {
       gravitationalConstant: -50,
       centralGravity: 0.01,
       springConstant: 0.08,
-      springLength: 100,
+      springLength: 80,  // Reduced from 100 to 80 (20% closer)
       damping: 0.4,
       avoidOverlap: 0
     },
@@ -191,10 +191,10 @@ const options = {
   },
   nodes: {
     shape: 'circle',
-    size: 28,  // Increased from 20 to 28 (40% increase)
-    borderWidth: 1,
+    size: 28,
+    borderWidth: 0.2,  // Reduced from 1 to 0.2 for a very thin border
     color: {
-      border: '#c0c0c0',
+      border: '#ffffff',  // Changed to white for a subtle border
       background: '#e0e0e0'
     }
   },