App.xaml

<Application x:Class="IMU_Reader.App"
             xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
             StartupUri="MainWindow.xaml">
    <Application.Resources>
        <Style TargetType="Button" x:Key="largeButton">
            <Setter Property="Template">
                <Setter.Value>
                    <ControlTemplate TargetType="Button">
                        <Border Name="Border"  
                                  CornerRadius="25" 
                                  BorderThickness="3"
                                  BorderBrush="{TemplateBinding BorderBrush}">
                            <Grid Margin="7" Background="{TemplateBinding Background}">
                                <ContentPresenter
                                        HorizontalAlignment="{TemplateBinding HorizontalContentAlignment}"
                                        VerticalAlignment="{TemplateBinding VerticalContentAlignment}"/>
                            </Grid>
                        </Border>
                        <ControlTemplate.Triggers>
                            <Trigger Property="IsPressed" Value="true">
                                <Setter TargetName="Border" Property="BorderBrush" Value="White"/>
                                <Setter TargetName="Border" Property="TextBlock.Foreground" Value="White"/>
                            </Trigger>
                        </ControlTemplate.Triggers>
                    </ControlTemplate>
                </Setter.Value>
            </Setter>
        </Style>
        <Style TargetType="Button" x:Key="smallButton">
            <Setter Property="Template">
                <Setter.Value>
                    <ControlTemplate TargetType="Button">
                        <Border Name="Border"  
                                  CornerRadius="15" 
                                  BorderThickness="3"
                                  BorderBrush="{TemplateBinding BorderBrush}">
                            <Grid Margin="7" Background="{TemplateBinding Background}">
                                <ContentPresenter
                                        HorizontalAlignment="{TemplateBinding HorizontalContentAlignment}"
                                        VerticalAlignment="{TemplateBinding VerticalContentAlignment}"/>
                            </Grid>
                        </Border>
                        <ControlTemplate.Triggers>
                            <Trigger Property="IsPressed" Value="true">
                                <Setter TargetName="Border" Property="BorderBrush" Value="White"/>
                                <Setter TargetName="Border" Property="TextBlock.Foreground" Value="White"/>
                            </Trigger>
                        </ControlTemplate.Triggers>
                    </ControlTemplate>
                </Setter.Value>
            </Setter>
        </Style>
        <Style x:Key="SimpleListBoxItem" TargetType="ListBoxItem">
            <Setter Property="FocusVisualStyle" Value="{x:Null}" />
            <Setter Property="Template">
                <Setter.Value>
                    <ControlTemplate TargetType="ListBoxItem">
                        <Border
                           Name="Border"
                           Padding="2"
                           SnapsToDevicePixels="true">
                            <ContentPresenter />
                        </Border>
                        <ControlTemplate.Triggers>
                            <Trigger Property="IsSelected" Value="true">
                                <Setter TargetName="Border" Property="Background" Value="#FF3A66C5"/>
                                <Setter TargetName="Border" Property="TextBlock.Foreground" Value="Orange"/>
                            </Trigger>
                        </ControlTemplate.Triggers>
                    </ControlTemplate>
                </Setter.Value>
            </Setter>
        </Style>
    </Application.Resources>
</Application>