diff --git a/trac/htdocs/main.css b/trac/htdocs/main.css
index 892b128..4b5e61e 100644
--- a/trac/htdocs/main.css
+++ b/trac/htdocs/main.css
@@ -82,6 +82,8 @@ th {
     background: #88AA77;
     color: #fff;
     font-weight: bold;
+    -moz-border-radius-topleft: 5px;
+    -webkit-border-radius-topright: 5px;
 }
 th a {
     color: #290c00;