diff --git a/contrib/static/dayman.css b/contrib/static/dayman.css
index 96e78b6..b9be28f 100644
--- a/contrib/static/dayman.css
+++ b/contrib/static/dayman.css
@@ -16,6 +16,6 @@ body {
     background: #FBFFC9;
 }
 
-.navbar, table, thead, th, table, pre {
+.navbar, table, thead, th, table, pre, .op {
     background: #FFECBE;
 }