conversations-classic/src/main/res/values-v21/themes.xml

<?xml version="1.0" encoding="utf-8"?>
<resources>

    <style name="ConversationsTheme" parent="@android:style/Theme.Material.Light.DarkActionBar">
        <item name="android:colorPrimary">@color/primary</item>
        <item name="android:colorPrimaryDark">@color/primary_dark</item>
        <item name="android:colorAccent">@color/accent</item>

        <item name="android:windowActionModeOverlay">true</item>
        <item name="android:actionModeBackground">@color/accent</item>

        <item name="TextSizeInfo">12sp</item>
        <item name="TextSizeBody">14sp</item>
        <item name="TextSizeHeadline">20sp</item>

        <item name="attr/icon_add_group">@drawable/ic_group_add_white_24dp</item>
        <item name="attr/icon_add_person">@drawable/ic_person_add_white_24dp</item>
        <item name="attr/icon_cancel">@drawable/ic_cancel_white_24dp</item>
        <item name="attr/icon_copy">@drawable/ic_content_copy_grey600_24dp</item>
        <item name="attr/icon_discard">@drawable/ic_delete_white_24dp</item>
        <item name="attr/icon_download">@drawable/ic_file_download_white_24dp</item>
        <item name="attr/icon_edit">@drawable/ic_edit_white_24dp</item>
        <item name="attr/icon_edit_dark">@drawable/ic_edit_grey600_24dp</item>
        <item name="attr/icon_done">@drawable/ic_done_black_24dp</item>
        <item name="attr/icon_group">@drawable/ic_group_white_24dp</item>
        <item name="attr/icon_new">@drawable/ic_add_white_24dp</item>
        <item name="attr/icon_refresh">@drawable/ic_refresh_grey600_24dp</item>
        <item name="attr/icon_new_attachment">@drawable/ic_attach_file_white_24dp</item>
        <item name="attr/icon_not_secure">@drawable/ic_lock_open_white_24dp</item>
        <item name="attr/icon_remove">@drawable/ic_delete_grey600_24dp</item>
        <item name="attr/icon_search">@drawable/ic_search_white_24dp</item>
        <item name="attr/icon_secure">@drawable/ic_lock_open_white_24dp</item>
        <item name="attr/icon_settings">@drawable/ic_settings_grey600_24dp</item>
        <item name="attr/icon_import_export">@drawable/ic_import_export_white_24dp</item>
        <item name="attr/icon_share">@drawable/ic_share_white_24dp</item>

    </style>

</resources>