diff --git a/src/gui/css/mainStyleSheet.tw b/src/gui/css/mainStyleSheet.tw
index b9d3ccbddcbd043bb408fc1d1d36c6d56ca70f2e..8faafdb51d0324856419c2b9293a8a72d5e1d862 100644
--- a/src/gui/css/mainStyleSheet.tw
+++ b/src/gui/css/mainStyleSheet.tw
@@ -76,6 +76,7 @@ object {
 .coral { color: coral }
 .cyan { color: cyan }
 .darkgoldenrod { color: darkgoldenrod }
+.darkred { color: darkred }
 .darkviolet { color: darkviolet }
 .deeppink { color: deeppink }
 .deepskyblue { color: deepskyblue }