diff --git a/doc/styles/LS.css b/doc/styles/LS.css
index b4f2a43f..5f05bcd1 100644
--- a/doc/styles/LS.css
+++ b/doc/styles/LS.css
@@ -52,7 +52,6 @@ pre.programlisting {
   -moz-border-radius:     6px;
   border-radius:          6px;
   border-width:           1px 1px 1px 6px;
-  opacity:                0.7;
   background-color:       #D4E8EE;
   padding:                0.5em;
   width:                  90%;