diff --git a/12/blank12_5.html b/12/blank12_5.html
index d714584..9dcee33 100644
--- a/12/blank12_5.html
+++ b/12/blank12_5.html
@@ -105,7 +105,7 @@
     <meta name="viewport" content="width=device-width, initial-scale=1">
     <title>Clock of the instable Now</title>
 </head>
-<body style="width: 100%; height: 100%;">
+<body style="width: 100%; height: 100%; overflow: hidden;">
 
 <img class= "muisding" id="ding" src="https://i.gifer.com/XVo6.gif"/>
 
