diff --git a/theme/wood/styles_color.css b/theme/wood/styles_color.css
index 753fefa97cc..2c945fbcaa9 100644
--- a/theme/wood/styles_color.css
+++ b/theme/wood/styles_color.css
@@ -24,7 +24,8 @@ ul.tabrow1 li a:visited,
 .sideblock .r0,
 .sideblock .r1,
 .generaltable .cell,
-div.sideblock table.minicalendar {
+div.sideblock table.minicalendar,
+.sideblock .hide-show a {
     border:none;
     background:none;
 }