style(flow): adjust default styles

src/style.css

@@ -63,7 +63,7 @@
 .react-flow__edge-path {
   fill: none;
   stroke: #bbb;
-  stroke-width: 2;
+  stroke-width: 1.5;
 }
 
 .react-flow__edge-text {
@@ -83,7 +83,7 @@
 .react-flow__connection-path {
   fill: none;
   stroke: #ddd;
-  stroke-width: 2;
+  stroke-width: 1.5;
 }
 
 .react-flow__nodes {
@@ -107,7 +107,7 @@
 .react-flow__node-input,
 .react-flow__node-output {
   padding: 10px;
-  border-radius: 5px;
+  border-radius: 3px;
   width: 150px;
   font-size: 12px;
   color: #222;
@@ -127,16 +127,16 @@
   }
 }
 
-.react-flow__node-default {
-  background: #ff6060;
-}
-
 .react-flow__node-input {
   background: #9999ff;
 }
 
+.react-flow__node-default {
+  background: #ff6060;
+}
+
 .react-flow__node-output {
-  background: #55dd99;
+  background: #79c9b7;
 }
 
 .react-flow__nodesselection {