diff --git a/AIStudio.Wpf.DiagramDesigner/Converters/BrushOpacityConverter.cs b/AIStudio.Wpf.DiagramDesigner/Converters/BrushOpacityConverter.cs
new file mode 100644
index 0000000..1c7d1ce
--- /dev/null
+++ b/AIStudio.Wpf.DiagramDesigner/Converters/BrushOpacityConverter.cs
@@ -0,0 +1,26 @@
+using System;
+using System.Globalization;
+using System.Windows.Data;
+using System.Windows.Media;
+
+namespace AIStudio.Wpf.DiagramDesigner
+{
+    public class BrushOpacityConverter : IValueConverter
+    {
+        public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
+        {
+            if (value is SolidColorBrush brush)
+            {
+                var opacity = System.Convert.ToDouble(parameter, CultureInfo.InvariantCulture);
+                return new SolidColorBrush(brush.Color)
+                {
+                    Opacity = opacity
+                };
+            }
+            return null;
+        }
+
+        public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture)
+            => Binding.DoNothing;
+    }
+}
diff --git a/AIStudio.Wpf.DiagramDesigner/Styles/Button.xaml b/AIStudio.Wpf.DiagramDesigner/Styles/Button.xaml
new file mode 100644
index 0000000..aae20fc
--- /dev/null
+++ b/AIStudio.Wpf.DiagramDesigner/Styles/Button.xaml
@@ -0,0 +1,48 @@
+<ResourceDictionary xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
+                    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
+                    xmlns:s="clr-namespace:AIStudio.Wpf.DiagramDesigner">
+
+    <s:BrushOpacityConverter x:Key="BrushOpacityConverter"/>
+    
+    <Style x:Key="AIStudio.Styles.Button.Flat" TargetType="{x:Type ButtonBase}">
+        <Setter Property="Background" Value="Transparent" />
+        <Setter Property="Foreground" Value="Black" />
+        <Setter Property="BorderBrush" Value="Transparent"/>
+        <Setter Property="BorderThickness" Value="1"/>
+        <Setter Property="Padding" Value="3" />
+        <Setter Property="MinHeight" Value="22" />
+        <Setter Property="Template">
+            <Setter.Value>
+                <ControlTemplate TargetType="{x:Type ButtonBase}">
+                    <Grid>
+                        <Border x:Name="border" 
+                                Background="{Binding RelativeSource={RelativeSource Mode=TemplatedParent}, Path=Background}" 
+                                CornerRadius="3" 
+                                Padding="{TemplateBinding Padding}" 
+                                BorderBrush="{TemplateBinding BorderBrush}" 
+                                BorderThickness="{TemplateBinding BorderThickness}">
+
+                            <ContentPresenter x:Name="content" RecognizesAccessKey="True" 
+                                         HorizontalAlignment="{TemplateBinding HorizontalContentAlignment}" 
+                                         VerticalAlignment="{TemplateBinding VerticalContentAlignment}" 
+                                         SnapsToDevicePixels="{TemplateBinding SnapsToDevicePixels}"/>
+                        </Border>
+                    </Grid>
+                    <!--触发器-->
+                    <ControlTemplate.Triggers>
+                        <!--设置鼠标进入时的背景、前景样式-->
+                        <Trigger Property="IsMouseOver" Value="true">
+                            <Setter Property="Background" TargetName="border" Value="{Binding Foreground,
+                                RelativeSource={RelativeSource Mode=TemplatedParent},
+                                Converter={StaticResource BrushOpacityConverter},
+                                ConverterParameter=0.16}" />
+                        </Trigger>
+                        <Trigger Property="IsEnabled" Value="false">
+                            <Setter Property="Opacity" Value="0.5"/>
+                        </Trigger>
+                    </ControlTemplate.Triggers>
+                </ControlTemplate>
+            </Setter.Value>
+        </Setter>
+    </Style>
+</ResourceDictionary>
\ No newline at end of file
diff --git a/AIStudio.Wpf.DiagramDesigner/Themes/Style.xaml b/AIStudio.Wpf.DiagramDesigner/Themes/Style.xaml
index 76d04a9..d1b58d2 100644
--- a/AIStudio.Wpf.DiagramDesigner/Themes/Style.xaml
+++ b/AIStudio.Wpf.DiagramDesigner/Themes/Style.xaml
@@ -1,6 +1,7 @@
 <ResourceDictionary xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
                     xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml">
     <ResourceDictionary.MergedDictionaries>
+        <ResourceDictionary Source="pack://application:,,,/AIStudio.Wpf.DiagramDesigner;component/Styles/Button.xaml" />
         <ResourceDictionary Source="pack://application:,,,/AIStudio.Wpf.DiagramDesigner;component/Styles/ScrollBar.xaml" />
         <ResourceDictionary Source="pack://application:,,,/AIStudio.Wpf.DiagramDesigner;component/Styles/Expander.xaml" />
         <ResourceDictionary Source="pack://application:,,,/AIStudio.Wpf.DiagramDesigner;component/Styles/GroupBox.xaml" />
diff --git a/Directory.Build.Props b/Directory.Build.Props
index b3d0e9d..4d652c4 100644
--- a/Directory.Build.Props
+++ b/Directory.Build.Props
@@ -1,7 +1,7 @@
 <Project>
   <!-- Project properties -->
   <PropertyGroup>
-    <TargetFrameworks>net461;netcoreapp3.1;net5.0-windows</TargetFrameworks>
+    <TargetFrameworks>netcoreapp3.1;net5.0-windows</TargetFrameworks>
   </PropertyGroup>
 
   <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Debug|AnyCPU'">