Alertdialog Kotlin in Fragment (with same theme as the default theme when showing from normal Activity)

alertdialog.kt

var alertDialogBuilder = AlertDialog.Builder(context, R.style.AlertDialogThemeCustom)
alertDialogBuilder.setTitle("Deletion")
alertDialogBuilder.setMessage("Do you confirm the deletion ?")
alertDialogBuilder.setCancelable(false)
alertDialogBuilder.setPositiveButton("Yes, delete", DialogInterface.OnClickListener { dialog, which ->
    // ...                                                              
    dialog.cancel()
} )
alertDialogBuilder.setNegativeButton("No, cancel", DialogInterface.OnClickListener { dialog, which ->
    // Do nothing
} )
val alertDialog = alertDialogBuilder.create()
alertDialog.show()

/*
    <style name="AlertDialogThemeCustom" parent="Theme.AppCompat.Light.Dialog.Alert">
        <item name="android:textColor">@color/alertdialog_black</item>
        <item name="android:windowBackground">@color/alertdialog_whitegrey</item>
    </style>
    
    <color name="alertdialog_black">#FF000000</color>
    <color name="alertdialog_whitegrey">#FFF2F2F2</color>
*/