USWDS - Site Alert - Repair top margin, broken by #4922 #5550
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Summary
Removed the top margin from the site alert component.
PR #4922 added a top margin to the site alert, which looks wrong when a site alert immediately follows a gov banner.
Breaking change
This is not a breaking change.
Related PR
Changelog PR
Preview link
This affects https://test.gcn.nasa.gov.
USWDS 3.1.0
USWDS 3.6.1, before this patch
After this patch
Problem statement
The site alert should not have any top margin. It didn't before USWDS 3.6.1. The margin looks like a glitch when a site alert immediately follows a gov banner.
Solution
Move the top margin back from the mixin to _usa-alert.scss so that applies to alerts but not site alerts.
Testing and review
I tested this locally to produce the screenshots above.
Dependency updates
None.