fix: replacing nav tab underlines with a border instead of a background gradient #49
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Problem
Part of the work on https://techfromsage.atlassian.net/browse/TA-1919
it's not possible to change the colour of the tab underlines with a separate css rule due to how it's implemented as a background gradient image. The tabs I'm referring to are these:
specifically the thick (4px) underline on the selected tab.
Change/Fix
This PR replaces it with a 4px border. They look identical to me, I've tested the update in Otis so I can see it still behaves correctly with working tabs (the tabs in the kitchen sink demo are not functional).
Checklist