diff --git a/static/scss/custom.scss b/static/scss/custom.scss
index 9ce673073c06bf8b3b995dc6120b1cbc78d08a81..5f5402bb8bc20a421e68695b37f51efbaabbab55 100644
--- a/static/scss/custom.scss
+++ b/static/scss/custom.scss
@@ -646,7 +646,7 @@ body.login #content_body .row > div.col-md-9 > p + div.container {
 }
 
 table.calendar, table.calendar td:empty {
-  background-color: lightgray;
+  background-color: #ddd;
 }
 
 table.calendar th, table.calendar td {