diff --git a/trac/htdocs/libcaca.css b/trac/htdocs/libcaca.css
index 6562e61..cd0695f 100644
--- a/trac/htdocs/libcaca.css
+++ b/trac/htdocs/libcaca.css
@@ -631,7 +631,9 @@ div.sidebar {
     color: #fff;
     background: #4e6a91;
 }
-
+.diff table th {
+    border-color: #4e6a91;
+}
 /*  */
 table#info li {
     background-image: none;