How to remove border from Dialog?

Question

I have an activity which is shown in a dialog:

In order to remove border and rounded corners, i tr

Answer 1

I played around a bit with other possibilities but using a 9 patch with fixed margins and found out that the layer-list drawable is allowing to define offsets, hence margins around its enclosed drawables, so this worked for me:

and then you can use this as the "android:windowBackground":