diff --git a/theme/wood/styles_color.css b/theme/wood/styles_color.css
index f223f03d60d..c63c72b8559 100644
--- a/theme/wood/styles_color.css
+++ b/theme/wood/styles_color.css
@@ -169,6 +169,7 @@ div.header,
 #calendar .maincalendar,
 .generalbox,
 .courseboxcontent,
+.categoryboxcontent,
 .cal_popup_fg {
     border-top:1px solid #FFCC99;
     border-left:1px solid #FFCC99;