diff --git a/static/index.html b/static/index.html
index 1ce6517..78900b9 100644
--- a/static/index.html
+++ b/static/index.html
@@ -10,6 +10,10 @@ html, body {
 }
 #surrogate-area {
     height:300px;
+}
+/* hide close button */
+.contented-close {
+    display: none;
 }
 		</style>
 	</head>