diff --git a/src/pages/overall/graph-overall/graph-overall.ts b/src/pages/overall/graph-overall/graph-overall.ts
index e73064e..a40f1e8 100644
--- a/src/pages/overall/graph-overall/graph-overall.ts
+++ b/src/pages/overall/graph-overall/graph-overall.ts
@@ -29,7 +29,8 @@ export default class GraphOverall extends Vue
             textStyle:
             {
                 fontSize: 11
-            }
+            },
+            icon: 'circle'
         },
         series:
         {