site: Optimize scroll bar style

[wanpan11]

[中文版模板 / Chinese template]

💡 Background and solution

优化滚动条样式，windows 下有点丑

目前

优化后

🔗 Related issue link

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Name	Status	Preview	Comments	Updated (UTC)
ant-design-web3	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Jun 4, 2024 8:10am

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