diff --git a/src/App.JsonCodeGen.cs b/src/App.JsonCodeGen.cs
index 901a9b5b..ba6bd96c 100644
--- a/src/App.JsonCodeGen.cs
+++ b/src/App.JsonCodeGen.cs
@@ -6,8 +6,8 @@ namespace SourceGit
     [JsonSourceGenerationOptions(WriteIndented = true, IgnoreReadOnlyFields = true, IgnoreReadOnlyProperties = true)]
     [JsonSerializable(typeof(List<Models.InteractiveRebaseJob>))]
     [JsonSerializable(typeof(Models.JetBrainsState))]
+    [JsonSerializable(typeof(Models.ThemeOverrides))]
     [JsonSerializable(typeof(Models.Version))]
-    [JsonSerializable(typeof(Models.CustomColorSchema))]
     [JsonSerializable(typeof(ViewModels.Preference))]
     [JsonSerializable(typeof(ViewModels.RepositorySettings))]
     internal partial class JsonCodeGen : JsonSerializerContext { }
diff --git a/src/App.axaml.cs b/src/App.axaml.cs
index 785b511c..8c9738fa 100644
--- a/src/App.axaml.cs
+++ b/src/App.axaml.cs
@@ -1,6 +1,5 @@
 using System;
 using System.Collections.Generic;
-using System.Globalization;
 using System.IO;
 using System.Net.Http;
 using System.Reflection;
@@ -144,7 +143,7 @@ namespace SourceGit
             app._activeLocale = targetLocale;
         }
 
-        public static void SetTheme(string theme, string colorsFile)
+        public static void SetTheme(string theme, string themeOverridesFile)
         {
             var app = Current as App;
 
@@ -155,63 +154,50 @@ namespace SourceGit
             else
                 app.RequestedThemeVariant = ThemeVariant.Default;
 
-            if (app._colorOverrides != null)
+            if (app._themeOverrides != null)
             {
-                app.Resources.MergedDictionaries.Remove(app._colorOverrides);
-                app._colorOverrides = null;
+                app.Resources.MergedDictionaries.Remove(app._themeOverrides);
+                app._themeOverrides = null;
             }
 
-            Models.CommitGraph.SetDefaultPens();
-
-            if (!string.IsNullOrEmpty(colorsFile) && File.Exists(colorsFile))
+            if (!string.IsNullOrEmpty(themeOverridesFile) && File.Exists(themeOverridesFile))
             {
                 try
                 {
                     var resDic = new ResourceDictionary();
-
-                    var schema = JsonSerializer.Deserialize(File.ReadAllText(colorsFile), JsonCodeGen.Default.CustomColorSchema);
-                    foreach (var kv in schema.Basic)
+                    var overrides = JsonSerializer.Deserialize(File.ReadAllText(themeOverridesFile), JsonCodeGen.Default.ThemeOverrides);
+                    foreach (var kv in overrides.BasicColors)
                     {
                         if (kv.Key.Equals("SystemAccentColor", StringComparison.Ordinal))
                             resDic["SystemAccentColor"] = Color.Parse(kv.Value);
                         else
                             resDic[$"Color.{kv.Key}"] = Color.Parse(kv.Value);
                     }
-                        
 
-                    if (schema.Graph.Count > 0)
+                    if (overrides.GraphColors.Count > 0)
                     {
                         var penColors = new List<Color>();
-
-                        foreach (var c in schema.Graph)
+                        foreach (var c in overrides.GraphColors)
                             penColors.Add(Color.Parse(c));
 
-                        Models.CommitGraph.SetPenColors(penColors);
+                        Models.CommitGraph.SetPens(penColors, overrides.GraphPenThickness);
                     }
-
-                    foreach (var kv in schema.General)
+                    else
                     {
-                        if (kv.Key.Equals("Pen.Thickness", StringComparison.Ordinal))
-                        {
-                            double thick = Models.CommitGraph.GetPenThickness();
-                            try
-                            {
-                                thick = double.Parse(kv.Value, CultureInfo.InvariantCulture);
-                            }
-                            catch
-                            {
-                            }
-                            Models.CommitGraph.SetPenThickness(thick);
-                        }
+                        Models.CommitGraph.SetDefaultPens(overrides.GraphPenThickness);
                     }
 
                     app.Resources.MergedDictionaries.Add(resDic);
-                    app._colorOverrides = resDic;
+                    app._themeOverrides = resDic;
                 }
                 catch
                 {
                 }
             }
+            else
+            {
+                Models.CommitGraph.SetDefaultPens();
+            }
         }
 
         public static async void CopyText(string data)
@@ -338,7 +324,7 @@ namespace SourceGit
             var pref = ViewModels.Preference.Instance;
 
             SetLocale(pref.Locale);
-            SetTheme(pref.Theme, pref.ColorOverrides);
+            SetTheme(pref.Theme, pref.ThemeOverrides);
         }
 
         public override void OnFrameworkInitializationCompleted()
@@ -383,6 +369,6 @@ namespace SourceGit
 
         private ViewModels.Launcher _launcher = null;
         private ResourceDictionary _activeLocale = null;
-        private ResourceDictionary _colorOverrides = null;
+        private ResourceDictionary _themeOverrides = null;
     }
 }
diff --git a/src/Models/CommitGraph.cs b/src/Models/CommitGraph.cs
index c0ffe820..9ed99904 100644
--- a/src/Models/CommitGraph.cs
+++ b/src/Models/CommitGraph.cs
@@ -108,30 +108,21 @@ namespace SourceGit.Models
             private set;
         } = new List<Pen>();
 
-        public static void SetDefaultPens()
+        public static void SetDefaultPens(double thickness = 1.5)
         {
-            SetPenColors(_defaultPenColors);
+            SetPens(_defaultPenColors, thickness);
         }
 
-        public static void SetPenColors(List<Color> colors)
+        public static void SetPens(List<Color> colors, double thickness)
         {
             Pens.Clear();
 
             foreach (var c in colors)
-                Pens.Add(new Pen(c.ToUInt32(), 2));
+                Pens.Add(new Pen(c.ToUInt32(), thickness));
 
             _penCount = colors.Count;
         }
 
-        public static void SetPenThickness(double value)
-        {
-            _penThickness = value;
-        }
-        public static double GetPenThickness()
-        {
-            return _penThickness;
-        }
-
         public static CommitGraph Parse(List<Commit> commits)
         {
             double UNIT_WIDTH = 12;
@@ -277,7 +268,6 @@ namespace SourceGit.Models
             return temp;
         }
 
-        private static double _penThickness = 1;
         private static int _penCount = 0;
         private static readonly List<Color> _defaultPenColors = [
             Colors.Orange,
diff --git a/src/Models/CustomColorSchema.cs b/src/Models/CustomColorSchema.cs
deleted file mode 100644
index 943b916e..00000000
--- a/src/Models/CustomColorSchema.cs
+++ /dev/null
@@ -1,11 +0,0 @@
-using System.Collections.Generic;
-
-namespace SourceGit.Models
-{
-    public class CustomColorSchema
-    {
-        public Dictionary<string, string> Basic { get; set; } = new Dictionary<string, string>();
-        public List<string> Graph { get; set; } = new List<string>();
-        public Dictionary<string,string> General { get; set; } = new Dictionary<string, string>();
-    }
-}
diff --git a/src/Models/ThemeOverrides.cs b/src/Models/ThemeOverrides.cs
new file mode 100644
index 00000000..96e48f82
--- /dev/null
+++ b/src/Models/ThemeOverrides.cs
@@ -0,0 +1,11 @@
+using System.Collections.Generic;
+
+namespace SourceGit.Models
+{
+    public class ThemeOverrides
+    {
+        public Dictionary<string, string> BasicColors { get; set; } = new Dictionary<string, string>();
+        public double GraphPenThickness { get; set; } = 1.5;
+        public List<string> GraphColors { get; set; } = new List<string>();
+    }
+}
diff --git a/src/Resources/Locales/en_US.axaml b/src/Resources/Locales/en_US.axaml
index 55b05a01..271a52dd 100644
--- a/src/Resources/Locales/en_US.axaml
+++ b/src/Resources/Locales/en_US.axaml
@@ -337,11 +337,11 @@
   <x:String x:Key="Text.Paste" xml:space="preserve">Paste</x:String>
   <x:String x:Key="Text.Preference" xml:space="preserve">Preference</x:String>
   <x:String x:Key="Text.Preference.Appearance" xml:space="preserve">APPEARANCE</x:String>
-  <x:String x:Key="Text.Preference.Appearance.ColorOverrides" xml:space="preserve">Custom Color Schema</x:String>
   <x:String x:Key="Text.Preference.Appearance.DefaultFont" xml:space="preserve">Default Font</x:String>
   <x:String x:Key="Text.Preference.Appearance.DefaultFontSize" xml:space="preserve">Default Font Size</x:String>
   <x:String x:Key="Text.Preference.Appearance.MonospaceFont" xml:space="preserve">Monospace Font</x:String>
   <x:String x:Key="Text.Preference.Appearance.Theme" xml:space="preserve">Theme</x:String>
+  <x:String x:Key="Text.Preference.Appearance.ThemeOverrides" xml:space="preserve">Theme Overrides</x:String>
   <x:String x:Key="Text.Preference.General" xml:space="preserve">GENERAL</x:String>
   <x:String x:Key="Text.Preference.General.AvatarServer" xml:space="preserve">Avatar Server</x:String>
   <x:String x:Key="Text.Preference.General.Check4UpdatesOnStartup" xml:space="preserve">Check for updates on startup</x:String>
diff --git a/src/Resources/Locales/zh_CN.axaml b/src/Resources/Locales/zh_CN.axaml
index 58a72d47..adf03079 100644
--- a/src/Resources/Locales/zh_CN.axaml
+++ b/src/Resources/Locales/zh_CN.axaml
@@ -340,11 +340,11 @@
   <x:String x:Key="Text.Paste" xml:space="preserve">粘贴</x:String>
   <x:String x:Key="Text.Preference" xml:space="preserve">偏好设置</x:String>
   <x:String x:Key="Text.Preference.Appearance" xml:space="preserve">外观配置</x:String>
-  <x:String x:Key="Text.Preference.Appearance.ColorOverrides" xml:space="preserve">自定义配色文件</x:String>
   <x:String x:Key="Text.Preference.Appearance.DefaultFont" xml:space="preserve">缺省字体</x:String>
   <x:String x:Key="Text.Preference.Appearance.DefaultFontSize" xml:space="preserve">默认字体大小</x:String>
   <x:String x:Key="Text.Preference.Appearance.MonospaceFont" xml:space="preserve">等宽字体</x:String>
   <x:String x:Key="Text.Preference.Appearance.Theme" xml:space="preserve">主题</x:String>
+  <x:String x:Key="Text.Preference.Appearance.ThemeOverrides" xml:space="preserve">主题自定义</x:String>
   <x:String x:Key="Text.Preference.General" xml:space="preserve">通用配置</x:String>
   <x:String x:Key="Text.Preference.General.AvatarServer" xml:space="preserve">头像服务</x:String>
   <x:String x:Key="Text.Preference.General.Check4UpdatesOnStartup" xml:space="preserve">启动时检测软件更新</x:String>
diff --git a/src/Resources/Locales/zh_TW.axaml b/src/Resources/Locales/zh_TW.axaml
index 73176126..d8d22032 100644
--- a/src/Resources/Locales/zh_TW.axaml
+++ b/src/Resources/Locales/zh_TW.axaml
@@ -340,11 +340,11 @@
   <x:String x:Key="Text.Paste" xml:space="preserve">貼上</x:String>
   <x:String x:Key="Text.Preference" xml:space="preserve">偏好設定</x:String>
   <x:String x:Key="Text.Preference.Appearance" xml:space="preserve">外觀配置</x:String>
-  <x:String x:Key="Text.Preference.Appearance.ColorOverrides" xml:space="preserve">自訂配色檔</x:String>
   <x:String x:Key="Text.Preference.Appearance.DefaultFont" xml:space="preserve">預設字型</x:String>
   <x:String x:Key="Text.Preference.Appearance.DefaultFontSize" xml:space="preserve">預設字型大小</x:String>
   <x:String x:Key="Text.Preference.Appearance.MonospaceFont" xml:space="preserve">等寬字型</x:String>
   <x:String x:Key="Text.Preference.Appearance.Theme" xml:space="preserve">主題</x:String>
+  <x:String x:Key="Text.Preference.Appearance.ThemeOverrides" xml:space="preserve">主題自訂</x:String>
   <x:String x:Key="Text.Preference.General" xml:space="preserve">通用配置</x:String>
   <x:String x:Key="Text.Preference.General.AvatarServer" xml:space="preserve">頭像服務</x:String>
   <x:String x:Key="Text.Preference.General.Check4UpdatesOnStartup" xml:space="preserve">啟動時檢測軟體更新</x:String>
diff --git a/src/ViewModels/Preference.cs b/src/ViewModels/Preference.cs
index 5198a8b8..431fd8d8 100644
--- a/src/ViewModels/Preference.cs
+++ b/src/ViewModels/Preference.cs
@@ -66,16 +66,16 @@ namespace SourceGit.ViewModels
             set
             {
                 if (SetProperty(ref _theme, value))
-                    App.SetTheme(_theme, _colorOverrides);
+                    App.SetTheme(_theme, _themeOverrides);
             }
         }
 
-        public string ColorOverrides
+        public string ThemeOverrides
         {
-            get => _colorOverrides;
+            get => _themeOverrides;
             set
             {
-                if (SetProperty(ref _colorOverrides, value))
+                if (SetProperty(ref _themeOverrides, value))
                     App.SetTheme(_theme, value);
             }
         }
@@ -487,7 +487,7 @@ namespace SourceGit.ViewModels
 
         private string _locale = "en_US";
         private string _theme = "Default";
-        private string _colorOverrides = string.Empty;
+        private string _themeOverrides = string.Empty;
         private FontFamily _defaultFont = null;
         private FontFamily _monospaceFont = null;
         private double _defaultFontSize = 13;
diff --git a/src/Views/Histories.axaml.cs b/src/Views/Histories.axaml.cs
index 6ac67d0b..05fe1a81 100644
--- a/src/Views/Histories.axaml.cs
+++ b/src/Views/Histories.axaml.cs
@@ -158,7 +158,6 @@ namespace SourceGit.Views
 
                 var geo = new StreamGeometry();
                 var pen = Models.CommitGraph.Pens[line.Color];
-                pen.Thickness = Models.CommitGraph.GetPenThickness();
 
                 using (var ctx = geo.Open())
                 {
diff --git a/src/Views/Preference.axaml b/src/Views/Preference.axaml
index 56561c46..5ca3b83f 100644
--- a/src/Views/Preference.axaml
+++ b/src/Views/Preference.axaml
@@ -229,15 +229,15 @@
                            Value="{Binding DefaultFontSize, Mode=TwoWay}"/>
 
             <TextBlock Grid.Row="4" Grid.Column="0"
-                       Text="{DynamicResource Text.Preference.Appearance.ColorOverrides}"
+                       Text="{DynamicResource Text.Preference.Appearance.ThemeOverrides}"
                        HorizontalAlignment="Right"
                        Margin="0,0,16,0"/>
             <TextBox Grid.Row="4" Grid.Column="1"
                      Height="28"
                      CornerRadius="3"
-                     Text="{Binding ColorOverrides, Mode=TwoWay}">
+                     Text="{Binding ThemeOverrides, Mode=TwoWay}">
               <TextBox.InnerRightContent>
-                <Button Classes="icon_button" Width="30" Height="30" Click="SelectColorSchemaFile">
+                <Button Classes="icon_button" Width="30" Height="30" Click="SelectThemeOverrideFile">
                   <Path Data="{StaticResource Icons.Folder.Open}" Fill="{DynamicResource Brush.FG1}"/>
                 </Button>
               </TextBox.InnerRightContent>
diff --git a/src/Views/Preference.axaml.cs b/src/Views/Preference.axaml.cs
index 0bc477f3..d483659c 100644
--- a/src/Views/Preference.axaml.cs
+++ b/src/Views/Preference.axaml.cs
@@ -210,18 +210,18 @@ namespace SourceGit.Views
             Close();
         }
 
-        private async void SelectColorSchemaFile(object sender, RoutedEventArgs e)
+        private async void SelectThemeOverrideFile(object sender, RoutedEventArgs e)
         {
             var options = new FilePickerOpenOptions()
             {
-                FileTypeFilter = [new FilePickerFileType("Theme Color Schema File") { Patterns = ["*.json"] }],
+                FileTypeFilter = [new FilePickerFileType("Theme Overrides File") { Patterns = ["*.json"] }],
                 AllowMultiple = false,
             };
 
             var selected = await StorageProvider.OpenFilePickerAsync(options);
             if (selected.Count == 1)
             {
-                ViewModels.Preference.Instance.ColorOverrides = selected[0].Path.LocalPath;
+                ViewModels.Preference.Instance.ThemeOverrides = selected[0].Path.LocalPath;
             }
 
             e.Handled = true;