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[bot]]

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](https://github.com/hlxsites/aem-boilerplate-commerce/pull/30/commits/00a93956b2b516b9696c93948beaa56c967d3108) :white_check_mark: (latest) * [8964e8a](https://github.com/hlxsites/aem-boilerplate-commerce/pull/30/commits/8964e8a55d8c7794c2243c8b8e2fe61f703389a2) :white_check_mark: * [8b0aa9f](https://github.com/hlxsites/aem-boilerplate-commerce/pull/30/commits/8b0aa9f2056fd93b938ec0dc50f6f4f38ccadb7c) :white_check_mark: * [152bc42](https://github.com/hlxsites/aem-boilerplate-commerce/pull/30/commits/152bc42c279024ef31de2cf64d479b507c2e1789) :white_check_mark:

[aem-code-sync[bot]]

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