diff --git a/site/theme/static/demo.less b/site/theme/static/demo.less
index 00a6cf638f..4b3601965f 100644
--- a/site/theme/static/demo.less
+++ b/site/theme/static/demo.less
@@ -43,9 +43,6 @@
 .code-box:target {
   border: 1px solid rgba(45, 183, 245, 0.7);
   box-shadow: 0 0 4px rgba(45, 183, 245, 0.5);
-  z-index: 10;
-  background: #fff;
-  position: relative;
 }
 
 .code-box {