CentralNotice should be part of header element (or, if you prefer so, some other landmark like main) in order to be part of an ARIA landmark.
Currently it's placed above header and outside of any landmark.
This essentially means moving banner-container.
We can move it either above or below the header
but given the header has a gray background mobile banners would be expected to set an appropriate background (not white like in Vector)
Please advise whether above or below the header is required.