diff --git a/spec/layout/demo/top-aside.md b/spec/layout/demo/top-aside.md
index 8b88227f5..1dbea1dae 100644
--- a/spec/layout/demo/top-aside.md
+++ b/spec/layout/demo/top-aside.md
@@ -135,7 +135,7 @@ ReactDOM.render(
 }
 
 .ant-layout-topaside .ant-layout-footer {
-  height; 64px;
+  height: 64px;
   line-height: 64px;
   text-align: center;
   font-size: 12px;