Update search and minicart styles

[herzog31]

• Improve styles of minicart and search overlays in header

Test URLs:

• Before: https://main--aem-boilerplate-commerce--hlxsites.hlx.live/
• After: https://improve-minicart--aem-boilerplate-commerce--hlxsites.hlx.live/

[aem-code-sync]

Hello, I'm the AEM Code Sync Bot and I will run some actions to deploy your branch and validate page speed.
In case there are problems, just click a checkbox below to rerun the respective action.

• Re-run PSI checks
• Re-sync branch

Commits

• 00a9395 ✅ (latest)
• 8964e8a ✅
• 8b0aa9f ✅
• 152bc42 ✅

[aem-code-sync]

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