Style - <TextBox>

    <Style x:Key="TextBoxStyle" TargetType="{x:Type TextBox}">
        <Setter Property="HorizontalContentAlignment" Value="Center"/>
        <Setter Property="VerticalContentAlignment" Value="Center"/>
        <Setter Property="Height" Value="20"/>
        <Setter Property="Margin" Value="0,0,0,0"/>
        <Style.Triggers>
            <Trigger Property="IsEnabled" Value="True">
                <Setter Property="Background" Value="White"/>
                <Setter Property="Foreground" Value="Black"/>
            </Trigger>
            <Trigger Property="IsEnabled" Value="False">
                <Setter Property="Background" Value="White"/>
                <Setter Property="Foreground" Value="Black"/>
            </Trigger>
        </Style.Triggers>
    </Style>