Add search button styles to global stylesheet.

[timcosgrove]

Description

Fixes the width of the search bar button and its styling.

Ticket

department-of-veterans-affairs/va.gov-cms#19410

Developer Task

Tasks

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1. PR submitted against the main branch of next-build.
2. Link to the issue that this PR addresses (if applicable).
3. Define all changes in your PR and note any changes that could potentially be breaking changes.
4. PR includes steps to test your changes and links to these changes in the Tugboat preview (if applicable).
5. Provided before and after screenshots of your changes (if applicable).
6. Alerted the #accelerated-publishing Slack channel to request a PR review.
7. You understand that once approved, you are responsible for merging your changes into main. (Note that changes to main will move automatically into production.)

QA steps

Open any page on Tugboat, switch to a mobile viewing width, and open the search bar (click on 'Menu' in the top bar). Example page: https://pr790-kwxsbtuohvekbxewpa4myvpdxxhfx3vd.tugboat.vfs.va.gov/outreach-and-events/events/

Screenshots

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After:

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Standard Checks

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1. Code Quality: Readabilty, Naming Conventions, Consistency, Reusability
2. Test Coverage: 80% coverage
3. Functionality: Change functions as expected with no additional bugs
4. Performance: Code does not introduce performance issues
5. Documentation: Changes are documented in their respective README.md files
6. Security: Packages have been approved in the TRM