How do I set my mandatory textbox background color with color selected in colorpicker in WPF MVVM

using System;
using System.Globalization;
using System.Windows.Data;
using System.Windows.Media;

namespace WpfApplication1
{
    public class ColorConverter : IValueConverter
    {
        public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
        {
            if (!(value is Color)) return null;

            var color = (Color) value;

            var solidColorBrush = new SolidColorBrush(color);

            return solidColorBrush;
        }

        public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture)
        {
            throw new NotImplementedException();
        }
    }
}

<Window x:Class="WpfApplication1.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:WpfApplication1"
        xmlns:xctk="http://schemas.xceed.com/wpf/xaml/toolkit"        
        mc:Ignorable="d"
        Title="MainWindow" Height="350" Width="525">
    
    <Window.Resources>
        <local:ColorConverter x:Key="ColorConverter"></local:ColorConverter>
    </Window.Resources>
    
    <Grid>
        <Grid.RowDefinitions>
            <RowDefinition></RowDefinition>
            <RowDefinition></RowDefinition>
        </Grid.RowDefinitions>
        <xctk:ColorPicker Name="ColorPicker"></xctk:ColorPicker>
        <TextBox Grid.Row="1"
                 Background="{Binding ElementName=ColorPicker, Path=SelectedColor, Converter={StaticResource ColorConverter}}"></TextBox>
    </Grid>
</Window>