modified the bound

main.py

@@ -29,11 +29,11 @@ def update_graph():
     for i,delay in enumerate(history):
         if delay>=5000:
             fill(img,i,red)
-        elif delay>=2000:
+        elif delay>=3000:
             fill(img,i,orange)
-        elif delay>=1000:
+        elif delay>=2000:
             fill(img,i,yellow)
-        elif delay>=500:
+        elif delay>=1000:
             fill(img,i,light_green)
         else:
             fill(img,i,green)