In android studio: button style output to physical. device is different from the style on the preview?

Question

Android

I'm experimenting with overriding different widget styles and can't solve this problem:

<resources>
    <style parent="Theme.AppCompat" name="AppTheme">
        <item name="colorPrimary">@color/red</item>
        <item name="colorPrimaryDark">@color/dark_red</item>
        <item name="colorAccent">@color/gray</item>
        <item name="android:buttonStyle">@style/BeatBoxButton</item>
        <item name="android:colorBackground">@color/soothing_blue</item>
    </style>

    <style parent="android:style/Widget.Holo.Button" name="BeatBoxButton" >
        <item name="android:background">@color/dark_blue</item>
        <item name="android:textStyle">italic</item>
    </style>
</resources>

With this redefinition of the style, the background and font style of the buttons are displayed unchanged, although everything is OK on the preview. What's the catch, folks?
actually the button:

<Button
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:id="@+id/list_item_sound_button"
    android:layout_width="match_parent"
    android:layout_height="120dp"
    tools:text="Sound name">

</Button>

Answer 1

So for the Button itself, the style attribute is not specified

Answer 2

it is overridden in the AppTheme