Remove background coloring for footer

- I think it looks nicer without it, plus visual bugs are fixed

Closes #122

go/static/css/styles.css

@@ -12,7 +12,6 @@ body {
   width: 100%;
   /* Set the fixed height of the footer here */
   height: 60px;
-  background-color: #f5f5f5;
 }
 .valign-center {
   height: 60px;