CSS anchor positioning

[TylerJDev]

Closes #

Changelog

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Rollout strategy

• Patch release
• Minor release
• Major release; if selected, include a written rollout or migration plan
• None; if selected, include a brief description as to why

Testing & Reviewing

Merge checklist

• Added/updated tests
• Added/updated documentation
• Added/updated previews (Storybook)
• Changes are SSR compatible
• Tested in Chrome
• Tested in Firefox
• Tested in Safari
• Tested in Edge
• (GitHub staff only) Integration tests pass at github/github-ui (Learn more about how to run integration tests)

[changeset-bot]

⚠️ No Changeset found

Latest commit: 2250621

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[github-actions]

⚠️ Action required

👋 Hi, this pull request contains changes to the source code that github/github-ui depends on. If you are GitHub staff, test these changes with github/github-ui using the integration workflow. Or, apply the integration-tests: skipped manually label to skip these checks.

[primer-integration]

👋 Hi from github/github-ui! Your integration PR is ready: https://github.com/github/github-ui/pull/14704

[primer]

🤖 Lint and formatting issues have been automatically fixed and committed to this PR.

[primer]

🤖 Lint issues have been automatically fixed and committed to this PR.

[primer-integration]

⚠️ Integration PR Outdated

This integration PR does not have the latest commit from the primer/react PR.

Integration PR references: 794f280c59c681c71edf6668c33ab62cbfab97a4
Latest commit on primer/react PR: 8368f2b880a2ab1ba090b13f35ba195acb60791e

Please update the integration PR to reference the latest commit from the primer/react PR before reviewing workflow results.

[primer]

🤖 Lint issues have been automatically fixed and committed to this PR.

[primer]

🤖 Lint and formatting issues have been automatically fixed and committed to this PR.

[primer]

🤖 Lint issues have been automatically fixed and committed to this PR.

[primer]

🤖 Lint issues have been automatically fixed and committed to this PR.

[primer]

🤖 Lint issues have been automatically fixed and committed to this PR.

[siddharthkp]

🤖 Lint and formatting issues have been automatically fixed and committed to this PR.

it keeps saying that but where is the commit? 😅

[TylerJDev]

🤖 Lint and formatting issues have been automatically fixed and committed to this PR.

it keeps saying that but where is the commit? 😅

The bot really doesn't like my PR 😆