ConsEco/Code/IHM/UCConnexion.xaml

<UserControl x:Class="IHM.UCConnexion"
             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:IHM"
             mc:Ignorable="d" 
             d:DesignHeight="450" d:DesignWidth="800"
             Style="{StaticResource ImageFondRessource}">

    <DockPanel>
        <TextBlock DockPanel.Dock="Top" Foreground="White" HorizontalAlignment="Center" FontSize="30" Margin="20">Connexion</TextBlock>
        <TextBlock DockPanel.Dock="Top" HorizontalAlignment="Center" FontSize="15" Margin="20">Connectez vous à un compte déjà existant</TextBlock>

        <Button Click="Button_Click_Acceuil" Margin="20" DockPanel.Dock="Bottom" Style="{StaticResource GreenButtonRessource}">
            <TextBlock Text="Retour à la page d'acceuil"/>
        </Button>
        
        <Button DockPanel.Dock="Bottom" Click="Button_Click_Connection" Style="{StaticResource GreenButtonRessource}" Height="25" Width="150">
            <TextBlock Text="Se connecter" Style="{StaticResource TextBlockRessource}"/>
        </Button>

        <Button DockPanel.Dock="Bottom" Click="Button_Click_Forget_Password" Style="{StaticResource OrangeButtonRessource}" Height="25" Width="170" Margin="20">
            <TextBlock Text="Mot de passe oublié ?" Style="{StaticResource TextBlockRessource}"/>
        </Button>

        <Grid>
            <Grid.ColumnDefinitions>
                <ColumnDefinition/>
                <ColumnDefinition/>
            </Grid.ColumnDefinitions>
            <Grid.RowDefinitions>
                <RowDefinition/>
                <RowDefinition/>
            </Grid.RowDefinitions>

            
            <TextBlock Style="{StaticResource TextBlockRessource}" FontSize="15">Nom d'utilisateur</TextBlock>
            <Border  Grid.Column="1" Style="{StaticResource BorderRessource}">
                <TextBox>
                    <TextBox.Resources>
                        <Style TargetType="{x:Type Border}">
                            <Setter Property="CornerRadius" Value="5"/>
                        </Style>
                    </TextBox.Resources>
                </TextBox>
            </Border>

            <TextBlock Grid.Row="1" Style="{StaticResource TextBlockRessource}" FontSize="15">Mot de passe</TextBlock>
            <Border  Grid.Column="1" Grid.Row="1" Style="{StaticResource BorderRessource}">
                <TextBox>
                    <TextBox.Resources>
                        <Style TargetType="{x:Type Border}">
                            <Setter Property="CornerRadius" Value="5"/>
                        </Style>
                    </TextBox.Resources>
                </TextBox>
            </Border>
        </Grid>
    </DockPanel>
</UserControl>