Cosmetic fix to pages css

pages/theme/static/css/main.css

@@ -203,10 +203,8 @@ a {
   margin-bottom: 2em;
 }
 .back-to-top {
-  padding-top: 2em;
   text-align: center;
-  margin-bottom: 6em;
-  margin-top: 2em;
+  margin-top: 4em;
 }
 .tag {
   background: #E1ECF4;