Help needed with NB Dialog

### Issue type

* [ ] bug report
* [ ] feature request
* [ X ] Help needed
### Issue description

**Current behavior:**
How do i set the fixed width of my dialog? it changes the size depends on the content

**Expected behavior:**
There is any configuration like on NGB Modal where you pass what size of modal you want?

**Steps to reproduce:**

**Related code:**


To Open:
const dialogRef = this.dialogService.open(ModalPessoasComponent);