--- a/rst.css	Sat Feb 20 23:44:10 2016 +0200
+++ b/rst.css	Sat Feb 20 23:47:53 2016 +0200
@@ -58,9 +58,7 @@
     text-decoration:none;
     color: hsl(240, 100%, 50%);
 }
-a:hover {
-    transparency: .5;
-}
+a:hover { opacity: .5; }
 h1 a {
     color: hsla(0, 0%, 0%, .8);
 }