diff --git a/site/common/styles/demo.less b/site/common/styles/demo.less
index 4d728029af..b3333434d8 100644
--- a/site/common/styles/demo.less
+++ b/site/common/styles/demo.less
@@ -133,8 +133,7 @@
 .code-box .collapse {
   position: absolute;
   right: 16px;
-  top: 50%;
-  margin-top: -9px;
+  bottom: 16px;
   cursor: pointer;
   width: 18px;
   height: 18px;