style: Adjust less style in global.less to avoid error tips in WebStorm and VS Code

[raoanqi]

Types of changes

• [ ] New feature
• [ ] Bug fix
• [ ] Enhancement
• [ ] Component style change
• [ ] Typescript definition change
• [ ] Documentation change
• [x] Coding style change
• [ ] Refactoring
• [ ] Test cases
• [ ] Continuous integration
• [ ] Breaking change
• [ ] Others

Background and context

If you open this project with the latest WebStorm(version: 2023.2.4) or VS Code(version: 1.83.1), there are error tips in global.less file. This won't impact launch project, but I adjust style to avoid this error tips appear in IDE or editor.

WebStorm screenshot: VS Code screenshot:

Solution

How is the change tested?

Changelog

Component	Changelog(CN)	Changelog(EN)	Related issues

Checklist:

• [x] Test suite passes (npm run test)
• [ ] Provide changelog for relevant changes (e.g. bug fixes and new features) if applicable.
• [x] Changes are submitted to the appropriate branch (e.g. features should be submitted to feature branch and others should be submitted to main branch)

Other information