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

<ResourceDictionary xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
                    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml">
    <SolidColorBrush x:Key="FloatBarBackground" Color="#9FFFFFFF" Opacity="0.6"/>
    <SolidColorBrush x:Key="FloatBarBorderBrush" Color="Black" Opacity="0.6"/>
    <SolidColorBrush x:Key="FloatBarForeground" Color="Black"/>
    <Color x:Key="FloatBarForegroundColor">#FF666666</Color>
</ResourceDictionary>