st虚拟滚动下边框小时

[JustForYouKing]

Reproduction link

https://stackblitz.com/edit/angular-lksfrr-xefxpx?file=src/app/app.component.ts

Steps to reproduce

1、配置虚拟滚动
2、设置st边框属性为true
3、显示出的无边框

What is expected?

显示边框

What is actually happening?

边框未显示

Environment	Info
ng-alain	11.8.1
Browser	Google Chrome 版本 89.0.4389.114（正式版本） （64 位）

[alain-bot]

Translation of this issue:

ST virtual scrolling lower frame hours

reproduction link

[https://stackblitz.com/edit/angular-lksfrr-xefxpx?file=src/app/app.component.ts](https://stackblitz.com/edit/angular-lksfr - xefxpx?file=src/ App / app.component.ts)

steps to reproduce

1. Configure virtual scrolling
   2, set the ST border properties to TRUE
   3, displayed boundless box

What is expected?

Show border

What is actually happens?

Border is not displayed

ENVIRONMENT	INFO
NG-alain	11.8.1
Browser	Google Chrome Version 89.0.4389.114 (official version) (64-bit)

[JustForYouKing]

st虚拟滚动下边框消失