WarningButtons.xaml

<ResourceDictionary xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
                    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml">

    <Style BasedOn="{StaticResource {x:Type Button}}"
       TargetType="{x:Type Button}"
       x:Key="ModernBtnWarning">
        <Style.Setters>
            <Setter Property="Template">
                <Setter.Value>
                    <ControlTemplate TargetType="Button">
                        <Border x:Name="Border" CornerRadius="10"
                            Background="red"
                            Width="{TemplateBinding Width}" Height="{TemplateBinding Height}">
                            <Grid>
                                <ContentPresenter x:Name="ContentPresenter" Margin="5"
                                              TextBlock.FontFamily="{DynamicResource Playfair Regular}"
                                              TextBlock.FontSize="16"
                                              TextBlock.Foreground="{DynamicResource LightBeige}"
                                              TextBlock.TextAlignment="Center"
                                              HorizontalAlignment="Center"
                                              VerticalAlignment="Center"
                                              RecognizesAccessKey="True" />
                            </Grid>
                        </Border>
                        <ControlTemplate.Triggers>
                            <Trigger Property="IsMouseOver" Value="True">
                                <Setter TargetName="Border" Property="Background" Value="{DynamicResource LightBeige}"/>
                                <Setter TargetName="Border" Property="BorderBrush" Value="red"/>
                                <Setter TargetName="Border" Property="BorderThickness" Value="2"/>
                                <Setter TargetName="ContentPresenter" Property="TextBlock.Foreground" Value="{DynamicResource BoldBlue}"/>
                            </Trigger>
                            <Trigger Property="IsPressed" Value="True">
                                <Setter TargetName="Border" Property="Background" Value="{DynamicResource BoldBlue}"/>
                                <Setter TargetName="ContentPresenter" Property="TextBlock.Foreground" Value="{DynamicResource LightBeige}"/>
                                <Setter TargetName="Border" Property="BorderThickness" Value="2"/>
                                <Setter TargetName="Border" Property="Opacity" Value="0.8"/>
                            </Trigger>
                        </ControlTemplate.Triggers>
                    </ControlTemplate>
                </Setter.Value>
            </Setter>
        </Style.Setters>
    </Style>
</ResourceDictionary>