diff --git a/src/timelines/RegularToot.css b/src/timelines/RegularToot.css
index 1fb46e1..79ef965 100644
--- a/src/timelines/RegularToot.css
+++ b/src/timelines/RegularToot.css
@@ -34,7 +34,7 @@
   }
 
   &.expanded {
-    z-index: calc(var(--tutu-zidx-nav) - 1);
+    z-index: calc(var(--tutu-zidx-nav) - 2);
     box-shadow: var(--tutu-shadow-e9);
   }