styles.xml

<resources>
    <!-- Style you can use with a container (typically a horizontal
         LinearLayout) to get the standard "button bar" background and
         spacing. @hide -->
    <style name="ButtonBar">
        <item name="android:paddingTop">5dip</item>
        <item name="android:paddingStart">4dip</item>
        <item name="android:paddingEnd">4dip</item>
        <item name="android:paddingBottom">1dip</item>
        <item name="android:background">@android:drawable/bottom_bar</item>
    </style>

    <style name="Holo.ButtonBar" parent="ButtonBar">
        <item name="android:paddingTop">0dip</item>
        <item name="android:paddingStart">0dip</item>
        <item name="android:paddingEnd">0dip</item>
        <item name="android:paddingBottom">0dip</item>
        <item name="divider">?android:attr/dividerVertical</item>
        <item name="showDividers">middle</item>
        <item name="dividerPadding">12dip</item>
        <item name="background">@null</item>
    </style>

    <style name="Widget.Holo.Light.Button" parent="Widget.Button">
        <item name="android:background">@android:drawable/btn_default_holo_light</item>
        <item name="android:textAppearance">?android:attr/textAppearanceMediumInverse</item>
        <item name="android:textColor">@android:color/primary_text_holo_light</item>
        <item name="android:minHeight">48dip</item>
        <item name="android:minWidth">64dip</item>
    </style>
</resources>