Steps to reproduce:
1) Create host with name - H1
2) Create item
3) Open trigger edit mode.
4) Add new expression.
5) On overlay dialog press Select to choose item.
Result:
Select button on overlay dialog has no borders.
![](https://support.zabbix.com/secure/thumbnail/158135/_thumb_158135.png)
Expected:
At least few pixels from Select button to overlay border.