diff --git a/src/components/FloorPopup.tsx b/src/components/FloorPopup.tsx
index c6b7168..5c93414 100644
--- a/src/components/FloorPopup.tsx
+++ b/src/components/FloorPopup.tsx
@@ -95,7 +95,7 @@ function FloorPopup({ title, position, data }: FloorMarkerProps) {
               )}
             </div>
           </div>
-          <div className="absolute w-0 h-0 border-[7px_0px_7px_8px] [border-color:_transparent_transparent_transparent_#fff] top-1/2 left-full" />
+          <div className="absolute w-0 h-0 border-[7px_0px_7px_8px] [border-color:_transparent_transparent_transparent_#fff] top-1/2 left-[calc(100%-1px)] -translate-y-1/2" />
         </motion.div>
       )}
     </AnimatePresence>