fullscreen dialog

FullscreenDialog.kt

...
override fun onCreate(savedInstanceState: Bundle?) {
    super.onCreate(savedInstanceState)
    setStyle(STYLE_NORMAL, R.style.FullScreenDialogTheme)
}
...

styles.xml

...
  <style name="FullScreenDialogTheme" parent="android:Theme.Dialog">
    <item name="android:layout_width">match_parent</item>
    <item name="android:layout_height">match_parent</item>

    <item name="android:windowBackground">@drawable/black_mask_86</item>
    <item name="android:windowNoTitle">true</item>
    <item name="android:windowIsFloating">false</item>
  </style>
...