Design fixes

[DavieReid]

Mostly adjustung the app header design to match spec

[changeset-bot]

⚠️ No Changeset found

Latest commit: 58a3d3a

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Name	Status	Preview	Comments	Updated (UTC)
mosaic	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Jul 18, 2023 10:44am

[coveralls]

Pull Request Test Coverage Report for Build 5586421008

• 2 of 2 (100.0%) changed or added relevant lines in 1 file are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage increased (+0.02%) to 63.261%

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Totals
Change from base Build 5573334804:	0.02%
Covered Lines:	1306
Relevant Lines:	1802

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💛 - Coveralls