Added slightly darker social icons so that they can have some opacity on hover

sass/index/_footer.scss

@@ -63,25 +63,31 @@ footer {
           float: left;
           margin-right: lh(.5);
 
-          a {
-            display: block;
-            height: 29px;
-            width: 28px;
-            text-indent: -9999px;
-          }
-
           &:after {
             content: none;
             display: none;
           }
 
+          a {
+            display: block;
+            height: 29px;
+            width: 28px;
+            text-indent: -9999px;
+
+            &:hover {
+              opacity: .8;
+            }
+          }
+
           &.twitter a {
             background: url('/static/images/marketing/twitter.png') 0 0 no-repeat;
           }
+
           &.facebook a {
             background: url('/static/images/marketing/facebook.png') 0 0 no-repeat;
           }
-          &.linkedin {
+
+          &.linkedin a {
             background: url('/static/images/marketing/linkedin.png') 0 0 no-repeat;
           }
         }