diff --git a/Map/default.css b/Map/default.css
index 55ed009..e16489f 100644
--- a/Map/default.css
+++ b/Map/default.css
@@ -54,7 +54,7 @@
 
 .main-menu li a.kokozukan:hover {
     background-image: url("../Map/birder/material/navpic3.JPG");
-    background-size: 98%;
+    background-size: 90%;
     animation: fadeIn 1s;
 }