kmpdfkit_demo/compdfkit_demo_windows/compdfkit/compdfkit-assets/Themes/Global.xaml

<ResourceDictionary xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
                    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml">
    <SolidColorBrush x:Key="color.bg.mainpage">#CECECE</SolidColorBrush>
    <SolidColorBrush x:Key="color.bg.jumpbar">#EFEFEF</SolidColorBrush>
    <SolidColorBrush x:Key="color.border.normal">#BBBBBB</SolidColorBrush>
</ResourceDictionary>