Header in HC theme overlaps with anchor content when navigating to page using anchor link

When navigating to a page using an anchor link, the content with the anchor should be fully visible (for the help center theme).

Steps to reproduce

1. Place an anchor on a page (that is part of a Viewport with the HC theme)

2. Navigate to the page in Viewport, using the anchor link </?contentKey=PageKey#anchor>

Expected results

The content with the anchor is fully visible (including any headings).

Actual results

The content with the anchor is covered by the header of the help center theme. 

Workaround

N/A