diff --git a/frontend/src/index.css b/frontend/src/index.css
index 06cb1b7..d76073c 100644
--- a/frontend/src/index.css
+++ b/frontend/src/index.css
@@ -178,6 +178,10 @@
   background-color: hsl(0 0% 8% / 0.65);
   border-color: var(--fc-border-color);
 }
+.fc .fc-col-header-cell.fc-day-sat,
+.fc .fc-col-header-cell.fc-day-sun {
+  background-color: hsl(0 0% 8% / 0.65) !important;
+}
 
 .fc-theme-standard td,
 .fc-theme-standard th {