UP/HelpHelf/Pages/AddBlogPage.xaml

<Page x:Class="HelpHelf.Pages.AddBlogPage"
      xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
      xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
      xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006" 
      xmlns:d="http://schemas.microsoft.com/expression/blend/2008" 
      xmlns:local="clr-namespace:HelpHelf.Pages"
      mc:Ignorable="d" 
      d:DesignHeight="450" d:DesignWidth="800"
      Title="AddBlogPage">

    <Grid>
        <StackPanel VerticalAlignment="Center">
            <TextBlock FontFamily="Calibri" 
                       Foreground=" #0B61A4" FontWeight="Bold"
                       FontSize="26" HorizontalAlignment="Center"
                       Text="Новая запись дневника"/>
            <GroupBox Margin="0,10,0,0" FontFamily="Calibri"
                      FontSize="20" Width="600" BorderBrush="#0B61A4"
                      BorderThickness="3" Header="Опишите ваше самочувствие">
                <TextBox TextWrapping="WrapWithOverflow" 
                     Height="200" Padding="2" Margin="5" Name="tbText"/>
            </GroupBox>
            <StackPanel Margin="0,20,0,0" HorizontalAlignment="Center"
                        Orientation="Horizontal">
                <Button Click="btnSave_Click" Background="White" Padding="5" 
                        BorderBrush="#0B61A4" BorderThickness="3"
                        FontFamily="Calibri" FontSize="20" Margin="0,0,5,0"
                        Name="btnSave" Width="160" Content="Сохранить"
                        Cursor="Hand"/>
                <Button Click="btnCancel_Click" Background="White" Padding="5" 
                        BorderBrush="#0B61A4" BorderThickness="3"
                        FontFamily="Calibri" FontSize="20" Margin="5,0,0,0"
                        Name="btnCancel" Width="160" Content="Назад"
                        Cursor="Hand"/>
            </StackPanel>
        </StackPanel>
    </Grid>
</Page>