diff --git a/trac/htdocs/main.css b/trac/htdocs/main.css
index 79c27e4..dd63cc1 100644
--- a/trac/htdocs/main.css
+++ b/trac/htdocs/main.css
@@ -76,6 +76,7 @@ legend {
     color: #290c00;
     border-bottom: 1px solid #290c00;
     background: #fff;
+    opacity: 0.7;
 }
 th {
     background: #88AA77;