【Cascader】级联菜单，菜单显示区域文字不显示

[AlanLee97]

Version

v1.0.0-beta.12

Vue Version

3.1.1

Link to minimal reproduction

https://vue-devui.github.io/components/cascader/

Step to reproduce

1. 点击级联框
2. 显示内容弹窗，文字区域显示了白色
   

What is expected

No response

What is actually happening

No response

Any additional comments (optional)

No response