kmpdfkit_demo/compdfkit_demo_windows/compdfkit/compdfkit-tools/Asset/Style/ButtonStyle.xaml

<ResourceDictionary xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
                    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml">
    <Style x:Key="TitleBarButtonStyle" TargetType="{x:Type Button}">
        <Setter Property="Background" Value="Transparent"></Setter>
        <Setter Property="BorderThickness" Value="0" />
        <Setter Property="HorizontalContentAlignment" Value="Center" />
        <Setter Property="VerticalContentAlignment" Value="Center" />
        <Setter Property="Padding" Value="0" />
        <Setter Property="Width" Value="30" />
        <Setter Property="Height" Value="30" />
        <Setter Property="IsTabStop" Value="False" />
        <Setter Property="Template">
            <Setter.Value>
                <ControlTemplate TargetType="{x:Type Button}">
                    <Border
                        x:Name="border"
                        Background="{TemplateBinding Background}"
                        BorderBrush="{TemplateBinding BorderBrush}"
                        BorderThickness="{TemplateBinding BorderThickness}"
                        SnapsToDevicePixels="true">
                        <ContentPresenter
                            x:Name="contentPresenter"
                            Margin="{TemplateBinding Padding}"
                            HorizontalAlignment="{TemplateBinding HorizontalContentAlignment}"
                            VerticalAlignment="{TemplateBinding VerticalContentAlignment}"
                            Focusable="False"
                            RecognizesAccessKey="True"
                            SnapsToDevicePixels="{TemplateBinding SnapsToDevicePixels}" />
                    </Border>
                    <ControlTemplate.Triggers>
                        <Trigger Property="IsMouseOver" Value="true">
                            <Setter TargetName="border" Property="Background" Value="#2894FF" />
                            <Setter TargetName="border" Property="BorderBrush" Value="#2894FF" />
                        </Trigger>
                        <Trigger Property="IsPressed" Value="true">
                            <Setter TargetName="border" Property="Background" Value="#2894FF" />
                            <Setter TargetName="border" Property="BorderBrush" Value="#FFFFFF" />
                        </Trigger>
                        <Trigger Property="IsEnabled" Value="false">
                            <Setter TargetName="contentPresenter" Property="TextElement.Foreground" Value="#FFE2E3E6" />
                            <Setter TargetName="contentPresenter" Property="Opacity" Value="0.5" />
                        </Trigger>
                    </ControlTemplate.Triggers>
                </ControlTemplate>
            </Setter.Value>
        </Setter>
    </Style>
</ResourceDictionary>