CourseProject_ended/Hotel_Course_Project/App.xaml

<Application x:Class="Hotel_Course_Project.App"
             xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
             xmlns:local="clr-namespace:Hotel_Course_Project"
             StartupUri="AuthorizationWindow.xaml">


    <Application.Resources>
        <ResourceDictionary>
            <Style TargetType="Grid">
                <Setter Property="Background">
                    <Setter.Value>
                        <RadialGradientBrush MappingMode="RelativeToBoundingBox" GradientOrigin="0.9,0.2" Center="0.5,0.5" RadiusX="0.7" RadiusY="0.7">
                            <GradientStop Color="#FF1B1B15" Offset="1"/>
                            <GradientStop Color="#FF142F2C"/>
                        </RadialGradientBrush>
                    </Setter.Value>
                </Setter>
            </Style>


            <Style TargetType="Button">
                <Setter Property="Template">
                    <Setter.Value>
                        <ControlTemplate TargetType="Button">
                            <Grid Background="{TemplateBinding Background}">
                                <ContentPresenter HorizontalAlignment="Center" VerticalAlignment="Center"/>
                            </Grid>
                        </ControlTemplate>
                    </Setter.Value>
                </Setter>

                <Setter Property="Template">
                    <Setter.Value>
                        <ControlTemplate TargetType="Button">
                            <Border Name="Border" CornerRadius="15" Background="#FF4F5856" BorderBrush="Black" MouseEnter="MouseEnter" MouseLeave="MouseLeave">
                                <ContentPresenter HorizontalAlignment="Center" VerticalAlignment="Center"/>
                            </Border>
                        </ControlTemplate>
                    </Setter.Value>
                </Setter>
                <Setter Property="Background" Value="{Binding ElementName=Border}"/>
            </Style>

            <Style TargetType="DataGrid">
                <Setter Property="FontSize" Value="20"/>


                <Setter Property="Foreground" Value="White"/>
                <Setter Property="RowBackground" Value="Transparent"/>
                <Setter Property="BorderBrush" Value="Transparent"/>
                <Setter Property="Background" Value="Transparent"/>
            </Style>

            <Style x:Key="ColumnHeaderStyle" TargetType="{x:Type DataGridColumnHeader}">
                <Setter Property="Background" Value="Transparent" />
                <Setter Property="FontWeight" Value="Bold"/>
            </Style>

            <Style x:Key="RowHeaderStyle" TargetType="{x:Type DataGridRowHeader}">
                <Setter Property="Background" Value="Transparent" />
            </Style>
        </ResourceDictionary>
    </Application.Resources>
</Application>