Fixed Menu Issues

When using `contain-to-grid fixed` with the header for a sticky fixed menu two problems occur:

1. The container loses its margin due to the menu now being fixed and not relative position, this is resolved by using .f-topbar-fixed > .container {margin-top:2rem;}.

2. The other problem is only visible when logged in as admin, basically the admin bar covers the fixed menu. This can be fixed by using a margin so both bars are visible:  .admin-bar > .fixed{margin-top:2rem;}