diff --git a/trac/htdocs/libcaca.css b/trac/htdocs/libcaca.css
index 99721b2..de0ba17 100644
--- a/trac/htdocs/libcaca.css
+++ b/trac/htdocs/libcaca.css
@@ -350,7 +350,7 @@ fieldset {
     background: #fff;
 }
 #attachments {
-    background: #000;
+    background: transparent;
     border: none;
 }
 #attachfile {