HereFishyFishy/olimp8/MainWindow.xaml

<Window x:Class="olimp8.MainWindow"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
        xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
        xmlns:local="clr-namespace:olimp8"
        mc:Ignorable="d"
        Title="MainWindow" Height="450" Width="600">
    <Grid>
        <Grid.RowDefinitions>
            <RowDefinition Height="70"></RowDefinition>
            <RowDefinition Height="*"></RowDefinition>
            <RowDefinition Height="50"></RowDefinition>
        </Grid.RowDefinitions>
        <Rectangle Fill="BlueViolet"></Rectangle>
        <Label x:Name="LoginLabel" VerticalAlignment="Center" HorizontalAlignment="Left" FontSize="20" Foreground="AliceBlue"></Label>
        <StackPanel Grid.Row="1" Orientation="Vertical" HorizontalAlignment="Center" VerticalAlignment="Center" Margin="10">
            <Button Width="200" Height="50" Content="Сотрудники" FontSize="20" Foreground="BlueViolet" Background="AliceBlue" Margin="10" Click="Button_Click_1"></Button>
            <Button Width="200" Height="50" Content="Смены" FontSize="20" Foreground="BlueViolet" Background="AliceBlue" Margin="10" Click="Button_Click"></Button>
            <Button Width="200" Height="50" Content="Заказы" FontSize="20" Foreground="BlueViolet" Background="AliceBlue" Margin="10"></Button>
        </StackPanel>
        <Rectangle Grid.Row="2" Fill="BlueViolet"></Rectangle>
    </Grid>
</Window>