Fix the skip-to-content button

[obulat]

Fixes

Fixes #4335 by @obulat

Description

This PR fixes the skip-to-content button.

I didn't add the snapshot tests so that we don't have too many. I could add if the reviewers think this necessary.

Testing Instructions

Run the app and press Tab. The skip to content button should not be full-width and should look correctly.

Checklist

• My pull request has a descriptive title (not a vague title likeUpdate index.md).
• My pull request targets the default branch of the repository (main) or a parent feature branch.
• My commit messages follow best practices.
• My code follows the established code style of the repository.
• I added or updated tests for the changes I made (if applicable).
• I added or updated documentation (if applicable).
• I tried running the project locally and verified that there are no visible errors.
• I ran the DAG documentation generator (just catalog/generate-docs for catalog
  PRs) or the media properties generator (just catalog/generate-docs media-props
  for the catalog or just api/generate-docs for the API) where applicable.

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[AetherUnbound]

LGTM when run locally!

[zackkrida]

👍 The homepage doesn't look great with the visible focus state on #content, but I'll make a new issue for that.