Adjust project structure

src/Shared/HandyControl_Shared/Themes/Styles/Base/GotoTopBaseStyle.xaml

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+<ResourceDictionary xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
+                    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
+                    xmlns:controls="clr-namespace:HandyControl.Controls">
+    
+    <ResourceDictionary.MergedDictionaries>
+        <ResourceDictionary Source="../../Basic/Geometries.xaml"/>
+        <ResourceDictionary Source="../Button.xaml"/>
+    </ResourceDictionary.MergedDictionaries>
+
+    <Style x:Key="GotoTopBaseStyle" BasedOn="{StaticResource ButtonBaseStyle}" TargetType="controls:GotoTop">
+        <Setter Property="Width" Value="50"/>
+        <Setter Property="Height" Value="50"/>
+        <Setter Property="controls:BorderElement.CornerRadius" Value="25"/>
+        <Setter Property="controls:IconElement.Geometry" Value="{StaticResource UpGeometry}"/>
+        <Setter Property="Foreground" Value="{DynamicResource PrimaryTextBrush}"/>
+        <Setter Property="Padding" Value="16"/>
+        <Setter Property="BorderThickness" Value="1"/>
+        <Style.Triggers>
+            <Trigger Property="IsMouseOver" Value="True">
+                <Setter Property="Background" Value="{DynamicResource DarkDefaultBrush}"/>
+            </Trigger>
+            <Trigger Property="IsPressed" Value="True">
+                <Setter Property="Background" Value="{DynamicResource BorderBrush}"/>
+            </Trigger>
+        </Style.Triggers>
+    </Style>
+
+</ResourceDictionary>