Add project files.

Nodify/Themes/Styles/StateNode.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:local="clr-namespace:Nodify">
+
+    <Style TargetType="{x:Type local:StateNode}">
+        <Setter Property="Padding"
+                Value="7 5" />
+        <Setter Property="BorderThickness"
+                Value="10" />
+        <Setter Property="BorderBrush"
+                Value="#484848" />
+        <Setter Property="Background"
+                Value="#171717" />
+        <Setter Property="Foreground"
+                Value="White" />
+        <Setter Property="HighlightBrush"
+                Value="#D6D3D6" />
+        <Setter Property="CornerRadius"
+                Value="3" />
+        <Setter Property="Template">
+            <Setter.Value>
+                <ControlTemplate TargetType="{x:Type local:StateNode}">
+                    <Border x:Name="Border"
+                            Padding="{TemplateBinding BorderThickness}"
+                            Margin="{TemplateBinding Margin}"
+                            CornerRadius="{TemplateBinding CornerRadius}">
+                        <Border x:Name="PART_Content"
+                                Background="{TemplateBinding Background}"
+                                Padding="{TemplateBinding Padding}"
+                                Cursor="SizeAll"
+                                MinWidth="30"
+                                MinHeight="30"
+                                CornerRadius="{TemplateBinding CornerRadius}">
+                            <ContentPresenter />
+                        </Border>
+                        <Border.Style>
+                            <Style TargetType="Border">
+                                <Setter Property="Background"
+                                        Value="{Binding BorderBrush, RelativeSource={RelativeSource TemplatedParent}}" />
+                                <Style.Triggers>
+                                    <Trigger Property="IsMouseDirectlyOver"
+                                             Value="True">
+                                        <Setter Property="Background"
+                                                Value="{Binding HighlightBrush, RelativeSource={RelativeSource TemplatedParent}}" />
+                                    </Trigger>
+                                </Style.Triggers>
+                            </Style>
+                        </Border.Style>
+                    </Border>
+                    <ControlTemplate.Triggers>
+                        <Trigger Property="local:PendingConnection.IsOverElement"
+                                 Value="True">
+                            <Setter Property="Background"
+                                    TargetName="Border"
+                                    Value="{Binding HighlightBrush, RelativeSource={RelativeSource TemplatedParent}}" />
+                        </Trigger>
+                    </ControlTemplate.Triggers>
+                </ControlTemplate>
+            </Setter.Value>
+        </Setter>
+    </Style>
+
+</ResourceDictionary>