diff --git a/front/css/system-dark-patch-cal.css b/front/css/system-dark-patch-cal.css
index 789d747b..a17e6fee 100755
--- a/front/css/system-dark-patch-cal.css
+++ b/front/css/system-dark-patch-cal.css
@@ -1,4 +1,4 @@
-@media (prefers-dark-scheme: dark) {
+@media (prefers-color-scheme: dark) {
 
   .fc-sat {  
   background-color: #444D56; }
diff --git a/front/presence.php b/front/presence.php
index b0495097..873b406a 100755
--- a/front/presence.php
+++ b/front/presence.php
@@ -223,7 +223,6 @@ switch ($UI_THEME) {
   case "System":
     echo '<link rel="stylesheet" href="css/system-dark-patch-cal.css">';
     break;
-
 }
 ?>