diff --git a/frontend/src/index.css b/frontend/src/index.css
index d9d1d76..e2ff451 100644
--- a/frontend/src/index.css
+++ b/frontend/src/index.css
@@ -170,7 +170,7 @@
    the tint must target the frame itself, not the td. */
 .fc .fc-day-sat .fc-daygrid-day-frame,
 .fc .fc-day-sun .fc-daygrid-day-frame {
-  background-color: hsl(0 0% 10% / 0.65) !important;
+  background-color: hsl(0 0% 9% / 0.65) !important;
 }