Update search styles to include shouty tab styling
Update search styles to include shouty tab styling

This was left out of the original migration from static as it occurred
as this work was happening.

It wasn't picked up that it was missing due to sass caches not busting
when viewing between the different versions (with/without feature flag
turned on).

alphagov/frontend,alphagov/frontend,alphagov/frontend,alphagov/frontend