textbox styling for all the forms in the project

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XAML

WPF

MVVM

Here is the code for the Textbox in one of my form(window1.xaml) here i have applied Textbox.style for the textbox, My requirement is i want to apply this same style for all the textboxes in my project all windows(window2.xaml,window3.xaml,.........)

<textbox grid.column="0" maxlength="1000" x:name="txtQuestionDesc" horizontalalignment="Stretch" textwrapping="Wrap" acceptsreturn="True" xmlns:x="#unknown">
             Grid.Row="1"        
             Margin="5,0,0,5" Height="100"  
                     Text="{Binding QuestionText, UpdateSourceTrigger=LostFocus}" &gt;
                    <textbox.style>
                        &lt;Style TargetType="TextBox" xmlns:sys="clr-namespace:System;assembly=mscorlib"&gt;
                            &lt;Style.Resources&gt;
                                <visualbrush x:key="CueBannerBrush" alignmentx="Left" alignmenty="Center" stretch="None">
                                    <visualbrush.visual>
                                        &lt;Label Content="Question Description" Foreground="LightGray" HorizontalAlignment="Center" /&gt;
                                    </visualbrush.visual>
                                </visualbrush>
                            &lt;/Style.Resources&gt;
                            &lt;Style.Triggers&gt;
                                <trigger property="Text" value="{x:Static sys:String.Empty}">
                                    <setter property="Background" value="{StaticResource CueBannerBrush}" />
                                </trigger>
                                <trigger property="Text" value="{x:Null}">
                                    <setter property="Background" value="{StaticResource CueBannerBrush}" />
                                </trigger>
                                <trigger property="IsKeyboardFocused" value="True">
                                    <setter property="Background" value="White" />
                                </trigger>
                            &lt;/Style.Triggers&gt;
                        &lt;/Style&gt;
                    </textbox.style>
                </textbox>