Fixes top margin at <md breakpoint #2636
Merged
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What are the relevant tickets?
N/A
Description (What does it do?)
Fixes issue with extra top margin at screen width >600px and <900px.
Screenshots (if appropriate):
Before:

After:

How can this be tested?
Size your browser window width to somewhere between 600px and 900px. Check that there is no gap between the header and the main content background. The issue on all pages, though less noticeable on the dashboard pages as they have no background <900px.
Additional Context
Introduced in #2620, which increased the header layout responsive breakpoint from 600px to 900px, but did not apply the same to margin calculation on the page wrapper top margin.