diff --git a/public/static/index/mobile/css/topic_nas_help-detail.css b/public/static/index/mobile/css/topic_nas_help-detail.css
index 0e8af98b..19b74c06 100644
--- a/public/static/index/mobile/css/topic_nas_help-detail.css
+++ b/public/static/index/mobile/css/topic_nas_help-detail.css
@@ -25,6 +25,7 @@
     flex-direction: row;
     justify-content: space-between;
     background: #fff;
+    z-index: 10;
 }
 
 .narshelpCenterdetail-app .headtop .logoicoimg {