Hi,
You need to edit the popups with CSS. The class to select the pop up is “.modal-dialog > .modal-content”. This class have the childrens “.modal-header” and “.modal-footer”.
If you want to resize the popups write this in your css:
.modal-dialog > .modal-content {
witdh: 100px;
}
This works for me in mendix 9. Maybe in mendix 8 the popup classes can be different. Only inspect the element in browser to see what class mendix 8 uses to popups.
Regards