NewPipe/app/src/main/res/values/styles.xml

<resources>

  <style name="RootTheme" parent="android:Theme.Holo">
  </style>

  <style name="PlayerTheme" parent="@style/RootTheme">
    <item name="android:windowNoTitle">true</item>
    <item name="android:windowBackground">@android:color/black</item>
  </style>

  <style name="ExoPlayerButton">
    <item name="android:layout_width">wrap_content</item>
    <item name="android:layout_height">wrap_content</item>
    <item name="android:minWidth">40dp</item>
  </style>

    <!-- Base application theme. -->
    <style name="AppTheme" parent="Theme.AppCompat.Light">
        <item name="android:actionBarStyle">@style/NewPipeActionbarTheme</item>
        <item name="actionBarStyle">@style/NewPipeActionbarTheme</item>
        <item name="colorPrimary">@color/light_youtube_primary_color</item>
        <item name="colorPrimaryDark">@color/light_youtube_dark_color</item>
        <item name="colorAccent">@color/light_youtube_accent_color</item>
        <item name="android:windowBackground">@color/light_background_color</item>
    </style>

    <style name="NewPipeActionbarTheme" parent="Widget.AppCompat.Light.ActionBar.Solid" >
        <item name="android:displayOptions">showHome</item>
        <item name="displayOptions">showHome</item>
        <item name="android:background">@color/light_youtube_primary_color</item>
        <item name="background">@color/light_youtube_primary_color</item>
    </style>

    <style name="VideoPlayerTheme" parent="Theme.AppCompat.Light.DarkActionBar">
        <item name="android:windowFullscreen">false</item>
        <item name="android:windowActionBarOverlay">true</item>
        <item name="windowActionBarOverlay">true</item>
        <item name="android:actionBarStyle">@style/VideoPlayerActionBarTheme</item>
        <item name="actionBarStyle">@style/VideoPlayerActionBarTheme</item>
        <item name="colorAccent">@color/light_youtube_primary_color</item>
        <item name="android:windowBackground">@android:color/black</item>
    </style>

    <style name="VideoPlayerActionBarTheme" parent="Widget.AppCompat.Light.ActionBar.Solid.Inverse" >
        <item name="android:displayOptions">showHome</item>
        <item name="displayOptions">showHome</item>
        <item name="android:background">@color/video_overlay_color</item>
        <item name="background">@color/video_overlay_color</item>
    </style>


    <!-- You can also inherit from NNF_BaseTheme.Light -->
    <style name="FilePickerTheme" parent="Theme.AppCompat.Light.NoActionBar">
        <!-- Set these to match your theme -->
        <item name="colorPrimary">@color/light_youtube_primary_color</item>
        <item name="colorPrimaryDark">@color/light_youtube_dark_color</item>
        <item name="colorAccent">@color/light_youtube_accent_color</item>

        <!-- Need to set this also to style create folder dialog -->
        <item name="alertDialogTheme">@style/FilePickerAlertDialogTheme</item>

        <!-- If you want to set a specific toolbar theme, do it here -->
        <!-- <item name="nnf_toolbarTheme">@style/ThemeOverlay.AppCompat.Dark.ActionBar</item> -->
    </style>

    <style name="FilePickerAlertDialogTheme" parent="Theme.AppCompat.Dialog.Alert">
        <item name="colorPrimary">@color/light_youtube_primary_color</item>
        <item name="colorPrimaryDark">@color/light_youtube_dark_color</item>
        <item name="colorAccent">@color/light_youtube_accent_color</item>
    </style>

</resources>