UI Rendering Issue

### Page URL https://docs.fluttercn.cn/ ### Page source https://github.com/flutter/website/blob/main/sites/docs/src/content/index.md ### Describe the problem <img width="305" height="401" alt="Image" src="https://github.com/user-attachments/assets/927c462d-e88e-4f5b-a551-a05114477aed" /> ### Expected fix _No response_ ### Additional context _No response_ ### I would like to fix this problem. - [ ] I will try and fix this problem on docs.flutter.dev.