diff --git a/demos/03_demo.md b/demos/03_demo.md
index 17a73a7c6d4581af6c0a07757cd69e123d44061d..c93ba546dcace56d07b6f92aa169e84164cedf9e 100644
--- a/demos/03_demo.md
+++ b/demos/03_demo.md
@@ -95,4 +95,4 @@ switch sr {
 	print("default")
 }
 ```
-{: .language-go}
+