Styling for connectors

MaterialGraphProject/Assets/GraphFramework/SerializableGraph/Editor/Drawing/Styles/SerializableGraph.uss

 }
 
 .Node NodeAnchor #connector {
-    background-color:#FF0;
-    border-color:#FF0;
+    background-color: rgb(20, 21, 21);
+    border-color: rgb(20, 21, 21);
-    width: 15;
-    height: 15;
+    width: 10;
+    height: 10;
+    border-radius: 15;
-    background-color:#00F;
+    background-color: rgb(220, 220, 220);
+    border-color: rgb(220, 220, 220);
 }
 
 .Node #input NodeAnchor {