meinWald/Code Android/meinWald/app/src/main/res/values/styles.xml

<resources>
    <!-- Base application theme. -->
    <style name="AppTheme" parent="Theme.AppCompat.Light.DarkActionBar">
        <!-- Customize your theme here. -->
        <item name="colorPrimary">@color/colorPrimary</item>
        <item name="colorPrimaryDark">@color/colorPrimaryDark</item>
        <item name="colorAccent">@color/colorAccent</item>
    </style>

    <style name="ImageTheme" parent="android:Theme.Dialog">

        <item name="android:layout_width">match_parent</item>
        <item name="android:layout_height">match_parent</item>
        <item name="android:layout_marginTop">20dp</item>
        <item name="android:layout_marginBottom">20dp</item>
        <item name="android:layout_marginLeft">10dp</item>
        <item name="android:layout_marginRight">10dp</item>
        <!-- No backgrounds, titles or window float -->
        <item name="android:windowNoTitle">true</item>
        <item name="android:windowIsFloating">false</item>
    </style>

</resources>