[AC-4549] fix: correct markdown css selectors

[bang9]

Changes

• correct markdown css

ticket: AC-4549

Additional Notes

Checklist

Before requesting a code review, please check the following:

• [Required] CI has passed all checks.
• [Required] A self-review has been conducted to ensure there are no minor mistakes.
• [Required] Unnecessary comments/debugging code have been removed.
• [Required] All requirements specified in the ticket have been accurately implemented.
• Ensure the ticket has been updated with the sprint, status, and story points.

[netlify]

✅ Deploy Preview for chat-ai-widget ready!

Name	Link
🔨 Latest commit	de60349
🔍 Latest deploy log	https://app.netlify.com/sites/chat-ai-widget/deploys/6761051fa5b61a0008bec46e
😎 Deploy Preview	https://deploy-preview-403--chat-ai-widget.netlify.app
📱 Preview on mobile	Toggle QR Code... Use your smartphone camera to open QR code link.

---

To edit notification comments on pull requests, go to your Netlify site configuration.

[github-actions]

Size Change: -97 B (-0.02%)

Total Size: 618 kB

Filename	Size	Change
./dist/__bundle-46d64517-********.js	4.01 kB	+2 B (+0.05%)
./dist/__bundle-b5ef7de4-********.js	890 B	-2 B (-0.22%)
./dist/index-********.js	304 kB	-2 B (0%)
./dist/index.es.js	170 B	-3 B (-1.73%)
./dist/index.umd.js	289 kB	+1 B (0%)
./dist/Placeholder.error-********.js	345 B	-2 B (-0.58%)
./dist/Placeholder.noChannels-********.js	182 B	-3 B (-1.62%)
./dist/Placeholder.noMessages-********.js	183 B	-2 B (-1.08%)
./dist/style.css	9.52 kB	-87 B (-0.91%)
./dist/TokensBody-********.js	9.1 kB	+1 B (+0.01%)

ℹ️ View Unchanged

Filename	Size
./dist/__bundle-7c3d40f4-********.js	21 B
./dist/Placeholder.loading-********.js	184 B
./dist/PlaceholderCommon-********.js	245 B

_{compressed-size-action}

[liamcho]

LGTM, thank you @bang9 !