<Window.Background>
     <!--镜像渐变-->
     <RadialGradientBrush Center="0.5,0" GradientOrigin="0.5,-0.5" RadiusX="0.7" RadiusY="1.2">
         <GradientStop Color="#ff61baff" Offset="0"/>
         <GradientStop Color="#ff29384e" Offset="1"/>
     </RadialGradientBrush>
 </Window.Background>