diff --git a/src/Models/Preference.cs b/src/Models/Preference.cs
index 36dd599d..ddb1fab1 100644
--- a/src/Models/Preference.cs
+++ b/src/Models/Preference.cs
@@ -62,7 +62,7 @@ namespace SourceGit.Models {
             /// <summary>
             ///     是否启用深色主题
             /// </summary>
-            public bool UseDarkTheme { get; set; } = true;
+            public bool UseDarkTheme { get; set; } = false;
 
             /// <summary>
             ///     起始页仓库列表排序规则
diff --git a/src/Resources/Themes/Dark.xaml b/src/Resources/Themes/Dark.xaml
index f183d48a..0dea1786 100644
--- a/src/Resources/Themes/Dark.xaml
+++ b/src/Resources/Themes/Dark.xaml
@@ -7,7 +7,7 @@
     <SolidColorBrush x:Key="Brush.TitleBar" Color="#FF1F1F1F"/>
     <SolidColorBrush x:Key="Brush.TabButtonHover" Color="#FF404040"/>
     <SolidColorBrush x:Key="Brush.Popup" Color="#FF2B2B2B"/>
-    <SolidColorBrush x:Key="Brush.Contents" Color="#FF1B1B1B"/>
+    <SolidColorBrush x:Key="Brush.Contents" Color="#FF1E1E1E"/>
     <SolidColorBrush x:Key="Brush.Badge" Color="#FF8F8F8F"/>
     <SolidColorBrush x:Key="Brush.Decorator" Color="#FF505050"/>
     <SolidColorBrush x:Key="Brush.DecoratorIcon" Color="#FFF8F8F8"/>
diff --git a/src/Views/Widgets/PageTabBar.xaml b/src/Views/Widgets/PageTabBar.xaml
index c04524a7..ae503bf4 100644
--- a/src/Views/Widgets/PageTabBar.xaml
+++ b/src/Views/Widgets/PageTabBar.xaml
@@ -74,7 +74,7 @@
                             <Setter Property="Template">
                                 <Setter.Value>
                                     <ControlTemplate TargetType="{x:Type ListBoxItem}">
-                                        <Border x:Name="Border" Background="Transparent" BorderBrush="Transparent" BorderThickness="1,1,1,0">
+                                        <Border x:Name="Border" Background="Transparent" BorderBrush="Transparent" BorderThickness="1,1,1,0" CornerRadius="4,4,0,0">
                                             <Grid x:Name="Contents" Width="160" VerticalAlignment="Center" Opacity=".5" ToolTip="{Binding Tooltip}">
                                                 <Path 
                                                     Width="8" Margin="8,0,0,0"