Fix style regression on contacts page from #6697 for notification dropdown and no contacts well

app/assets/stylesheets/contacts.scss

 .page-contacts {
   .sidebar { padding-bottom: 10px; }
 
-  .header {
+  .stream.contacts .header {
     border-bottom: 1px solid $border-grey;
     min-height: 55px;
     form { margin: 0; }
@@ -65,7 +65,7 @@
       text-align: center;
       margin-top: 50px;
     }
-    .well { margin: 20px 0 10px; }
+    .well { margin: 10px; }
   }
 }