App.xaml

<Application x:Class="RP_to_Eur.App"
             xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
             xmlns:local="clr-namespace:RP_to_Eur"
             StartupUri="MainWindow.xaml">
    <Application.Resources>
        <Style x:Key="ModernListView" TargetType="{x:Type ListView}">
            <Setter Property="Background" Value="#212121" />
            <Setter Property="Foreground" Value="#FF002353" />
            <Setter Property="Margin" Value="5" />
            <Setter Property="Padding" Value="5" />
        </Style>
        <Style x:Key="ModernDataGrid" TargetType="{x:Type DataGrid}">
            <Setter Property="Background" Value="#212121" />
            <Setter Property="Foreground" Value="#FFF" />
            <Setter Property="RowBackground" Value="#212121" />
            <Setter Property="GridLinesVisibility" Value="None" />
            <Setter Property="CanUserAddRows" Value="False" />
            <Setter Property="ColumnHeaderStyle">
                <Setter.Value>
                    <Style TargetType="{x:Type DataGridColumnHeader}">
                        <Setter Property="Background" Value="#212121" />
                        <Setter Property="Foreground" Value="#FFF" />
                        <Setter Property="HorizontalContentAlignment" Value="Center" />
                        <Setter Property="VerticalContentAlignment" Value="Center" />
                        <Setter Property="Padding" Value="6" />
                        <Setter Property="BorderThickness" Value="0,0,1,1" />
                        <Setter Property="BorderBrush" Value="#454545" />
                        <Setter Property="FontWeight" Value="Bold" />
                    </Style>
                </Setter.Value>
            </Setter>
            <Setter Property="CellStyle">
                <Setter.Value>
                    <Style TargetType="{x:Type DataGridCell}">
                        <Setter Property="Foreground" Value="#FFF" />
                        <Setter Property="BorderThickness" Value="0,0,1,1" />
                        <Setter Property="BorderBrush" Value="#454545" />
                        <Setter Property="Padding" Value="6" />
                        <Style.Triggers>
                            <Trigger Property="IsSelected" Value="True">
                                <Setter Property="Background" Value="#0073a4" />
                                <Setter Property="BorderBrush" Value="#FFA1B8FF" />
                                <Setter Property="Foreground" Value="#FFF" />
                            </Trigger>
                        </Style.Triggers>
                    </Style>
                </Setter.Value>
            </Setter>
        </Style>
        <Style x:Key="StandardButtonStyle" TargetType="{x:Type Button}">
            <Setter Property="Background" Value="#007ACC"/>
            <Setter Property="Foreground" Value="White"/>
            <Setter Property="Height" Value="30"/>
            <Setter Property="Width" Value="100"/>
            <Setter Property="FontWeight" Value="Bold"/>
            <Setter Property="Padding" Value="10,5"/>
            <Setter Property="BorderThickness" Value="0"/>
            <Setter Property="Template">
                <Setter.Value>
                    <ControlTemplate TargetType="{x:Type Button}">
                        <Border BorderBrush="{TemplateBinding BorderBrush}"
                                BorderThickness="{TemplateBinding BorderThickness}"
                                Background="{TemplateBinding Background}"
                                CornerRadius="2">
                            <ContentPresenter HorizontalAlignment="{TemplateBinding HorizontalContentAlignment}"
                                              VerticalAlignment="{TemplateBinding VerticalContentAlignment}"
                                              RecognizesAccessKey="True"/>
                        </Border>
                        <ControlTemplate.Triggers>
                            <Trigger Property="IsPressed" Value="True">
                                <Setter Property="Background" Value="#00588C"/>
                            </Trigger>
                            <Trigger Property="IsEnabled" Value="False">
                                <Setter Property="Opacity" Value="0.5"/>
                            </Trigger>
                        </ControlTemplate.Triggers>
                    </ControlTemplate>
                </Setter.Value>
            </Setter>
        </Style>
    </Application.Resources>
</Application>