diff --git a/dag.html b/dag.html
index 13f269d8..31d21f19 100644
--- a/dag.html
+++ b/dag.html
@@ -285,7 +285,16 @@
                 option = {
                     tooltip: {
                         trigger: 'item',
-                        triggerOn: 'mousemove'
+                        triggerOn: 'mousemove',
+                        formatter: "{b}",
+                        backgroundColor: '#F6F8FC',
+                        borderColor: '#8C8D8E',
+                        borderWidth: 1,
+                        padding: [3, 3, 3, 3],
+                        textStyle: {
+                            color: '#4C5058',
+                            fontSize: 18
+                        }
                     },
                     series: [
                         {