My `DatePickerDialog` doesn't work properly. For example selected day is of white color. Notice that Cancel and OK button are also of white color. How could I change it?

[![https://tinypic.pl/phfssq7zm5s8](https://i.stack.imgur.com/C6Uzc.png)](https://i.stack.imgur.com/C6Uzc.png)

Here is the code:

```
 fun openCalendar() {
    val c = Calendar.getInstance()
    val year = c.get(Calendar.YEAR)
    val month = c.get(Calendar.MONTH)
    val day = c.get(Calendar.DAY_OF_MONTH)

    val dpd = DatePickerDialog(this, DatePickerDialog.OnDateSetListener {
            view, year, monthOfYear, dayOfMonth ->

    }, year, month, day)

    dpd.show()
 }

```