LightMenuBackgroundStyle

<style name="Theme.MyTheme" parent="@android:style/Theme.Holo.Light.DarkActionBar">
    <item name="android:popupMenuStyle">@style/PopupMenu.MyPopupMenu</item>
</style>
<style name="PopupMenu.Example" parent="@android:style/Widget.Holo.Light.ListPopupWindow">
    <!--
    Set @color/my_color to whatever you want; I'm assuming it'll be #FFFFFF, but you may prefer
    something off-white
    -->
        <item name="android:popupBackground">@color/my_color</item>
</style>