View file Android_klient/MobileApp/res/values/styles.xml

<resources>

    <style name="AppTheme" parent="AppBaseTheme">
        <!-- All customizations that are NOT specific to a particular API-level can go here. -->
    </style>

    <style name="MainBackground">
        <item name="android:background">@drawable/main_background</item>
    </style>

    <style name="horiz_sep">
        <item name="android:layout_width">match_parent</item>
        <item name="android:layout_height">1px</item>
        <item name="android:background">#CCC</item>
    </style>

</resources>