diff --git a/static/css/main.css b/static/css/main.css
index c8fbff0..a34a31f 100644
--- a/static/css/main.css
+++ b/static/css/main.css
@@ -340,6 +340,14 @@ div.network-source{
 
 }
 
+.card.calendar.past {
+  opacity: 0.3;
+}
+
+.card.calendar.past:hover {
+  opacity: 1;
+}
+
 .h-event.calendar header {
   display: flex;
   border-bottom: 2px solid cornflowerblue;