Fix typo

css/style.css

@@ -437,7 +437,7 @@ a {
 
 #intro {
   /*background: top, transparent red, faked with gradient;*/
-  background: gradient(rgba(0, 0, 0, 0.65), rgba(0, 0, 0, 0.65)), url('../images/netneutrality.jpg') 50% 0 repeat-y fixed;
+  background: linear-gradient(rgba(0, 0, 0, 0.65), rgba(0, 0, 0, 0.65)), url('../images/netneutrality.jpg') 50% 0 repeat-y fixed;
   -webkit-background-size: cover;
   background-size: cover;
   background-position: center center;