diff --git a/frontend/src/pages/CalendarPage.jsx b/frontend/src/pages/CalendarPage.jsx
index f8751af..3ba94e6 100644
--- a/frontend/src/pages/CalendarPage.jsx
+++ b/frontend/src/pages/CalendarPage.jsx
@@ -1632,7 +1632,7 @@ const CalendarPage = () => {
                                 <div
                                   key={`${monthIndex}-${day}`}
                                   className={`
-                                    relative
+                                    relative isolate
                                     border-b border-r border-border
                                     bg-card
                                     px-2