diff --git a/extension/BMap/doc/example.html b/extension/BMap/doc/example.html
index 8d93fcdbe55203ab50fad677b2b475a61c77faf7..49f39469b53190f25afd9022d1fe960ad0b18267 100644
--- a/extension/BMap/doc/example.html
+++ b/extension/BMap/doc/example.html
@@ -6,6 +6,9 @@
body {
margin: 0;
}
+ #main {
+ height: 100%;
+ }