InkCanvasForClass/Ink Canvas/Resources/Styles/Dark.xaml

<!--
<ResourceDictionary xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
                    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml">
    <SolidColorBrush x:Key="ToolBarBackground" Color="#88000000"/>
    <SolidColorBrush x:Key="ToolBarBorderBrush" Color="#BFcccccc"/>
    <SolidColorBrush x:Key="ToolBarForeground" Color="#cccccc"/>
    <Color x:Key="ToolBarForegroundColor">#FFcccccc</Color>
</ResourceDictionary>
-->
<ResourceDictionary xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
                    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml">
    <SolidColorBrush x:Key="ToolBarBackground" Color="Black" Opacity="0.5"/>
    <SolidColorBrush x:Key="ToolBarBorderBrush" Color="White" Opacity="0.5"/>
    <SolidColorBrush x:Key="ToolBarForeground" Color="White"/>
    <Color x:Key="ToolBarForegroundColor">#FFcccccc</Color>
</ResourceDictionary>