diff --git a/frontend/src/components/AppShell.tsx b/frontend/src/components/AppShell.tsx
index 4f76f113..e0c709ee 100644
--- a/frontend/src/components/AppShell.tsx
+++ b/frontend/src/components/AppShell.tsx
@@ -618,7 +618,7 @@ function LeftNav({
       className={`hidden shrink-0 transition-[width] duration-200 lg:block ${compact ? "w-14" : "w-64"}`}
     >
       <div
-        className={`space-y-4 transition-[width] duration-200 lg:overflow-y-auto ${expanded ? "z-[35] lg:w-64" : ""} ${
+        className={`space-y-4 transition-[width] duration-200 lg:overflow-y-auto ${expanded ? "z-[70] lg:w-64" : ""} ${
           fixedDesktop
             ? `lg:fixed lg:top-0 lg:bottom-0 lg:pt-[4.5rem] lg:pb-8 ${compact ? `lg:left-3 ${expanded ? "lg:w-64" : "lg:w-14"}` : "lg:w-64"}`
             : "lg:sticky lg:top-8 lg:max-h-[calc(100dvh-7.5rem)] lg:pb-2"
diff --git a/frontend/src/components/calendar/CalendarSidebar.tsx b/frontend/src/components/calendar/CalendarSidebar.tsx
index 3e05da9a..46a128a7 100644
--- a/frontend/src/components/calendar/CalendarSidebar.tsx
+++ b/frontend/src/components/calendar/CalendarSidebar.tsx
@@ -44,7 +44,7 @@ export const CalendarSidebar = memo(function CalendarSidebar(
     return (
       <aside className="hidden w-14 shrink-0 transition-[width] duration-200 lg:block">
         <div
-          className={`z-[35] overflow-hidden transition-[width] duration-200 ${expanded ? "lg:w-72" : "lg:w-14"} ${
+          className={`z-[70] overflow-hidden transition-[width] duration-200 ${expanded ? "lg:w-72" : "lg:w-14"} ${
             fixedDesktop
               ? "lg:fixed lg:bottom-0 lg:right-3 lg:top-0 lg:pt-[4.5rem] lg:pb-8"
               : "lg:sticky lg:top-8 lg:max-h-[calc(100dvh-7.5rem)] lg:pb-2"