android layout - Remove the white border of Custom Dialog which is an activity -

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i have custom dialog, has label , text box , 2 buttons.
decided build activity dialog, , in manifest file, mentioned theme dialog.

so custom dialog working fine.
but, want remove white boder of custom dialog.

i read other posts,which can remove border using

<item name="android:windowbackground">@color/transparent_white</item>

however in case activity, looks dialog. please help


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