Custom notification

I have made 3 custom dialog in the app. whenever I am calling the notification the corners of the dialog is sharp. I want to make it round.
I have tried following.
If I use vertical arrangement as custom dialog and tick Iscard and round card then also corner are round but black portion coming at the corner.
If I use card view as custom dialog and then also black border with 2 mm width all around the dialog is coming.
I have also tried to uncheck the use background color in the notifier component, but not working.

Request suggest a wayout for this
thanks in anticipation

Try [UPDATE] Free Alpha Dialog | Transparent Dialogs, Custom Toasts and much more


thank you
this should solve my problem

Yes you can use alpha dialogue I use it . Second in cardviwe make evulation " 0"