diff --git a/src/layout/nav/AppHeader.less b/src/layout/nav/AppHeader.less
index 07dffb5..2d7cbe1 100644
--- a/src/layout/nav/AppHeader.less
+++ b/src/layout/nav/AppHeader.less
@@ -183,7 +183,7 @@
 .ant-dropdown.site-header-top-dropdown-menu {
   // Make the top menu dropdown full-width and slightly larger on mobile
   @media (max-width: @screen-md) {
-    position: absolute;
+    position: fixed;
 
     top: @layout-header-height !important;
     left: 0 !important;