Fix announcement banner margin

[zenoachtig]

Because of .scroll-nojump, which needed to be nested as its own div.

[github-actions]

Summary of the deployments:

Version 1 (production)

Version	URL	Status
Latest commit	https://5f7c9563.gitbook-open.pages.dev	✅
PR	https://pr3056.gitbook-open.pages.dev	✅

Version 2 (experimental)

Version	URL	Status
Vercel	https://gitbook-v2-bn7qkzlgb-gitbook.vercel.app	✅
Cloudflare	https://74334ef0-gitbook-open-v2-preview.gitbook.workers.dev	✅

Test content

Site	v1	v2
GitBook	https://5f7c9563.gitbook-open.pages.dev/docs.gitbook.com	https://gitbook-v2-bn7qkzlgb-gitbook.vercel.app/url/docs.gitbook.com
E2E	https://5f7c9563.gitbook-open.pages.dev/gitbook.gitbook.io/test-gitbook-open	https://gitbook-v2-bn7qkzlgb-gitbook.vercel.app/url/gitbook.gitbook.io/test-gitbook-open

[argos-ci]

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Build	Status	Details	Updated (UTC)
customers-v1 (Inspect)	✅ No changes detected	-	Mar 27, 2025, 12:17 PM
customers-v2 (Inspect)	👍 Changes approved	6 changed	Mar 27, 2025, 12:19 PM
default (Inspect)	👍 Changes approved	7 changed	Mar 27, 2025, 12:43 PM
v2-vercel (Inspect)	✅ No changes detected	-	Mar 27, 2025, 12:45 PM