diff --git a/XeRelease_Gtkmm4/CMakeLists.txt b/XeRelease_Gtkmm4/CMakeLists.txt
index 8eec3d9..d793842 100644
--- a/XeRelease_Gtkmm4/CMakeLists.txt
+++ b/XeRelease_Gtkmm4/CMakeLists.txt
@@ -27,6 +27,7 @@ set(SOURCES src/main.cc src/MyWin.cc src/MyPrefs.cc
 #Compile resources with GCR_CMake
 set(RESOURCE_LIST
     style.css
+    style_dark.css
     STRIPBLANKS menubar.xml
     STRIPBLANKS prefs.ui
     icons/16x16/actions/open-menu.png
diff --git a/XeRelease_Gtkmm4/res/style_dark.css b/XeRelease_Gtkmm4/res/style_dark.css
new file mode 100644
index 0000000..456986e
--- /dev/null
+++ b/XeRelease_Gtkmm4/res/style_dark.css
@@ -0,0 +1,10 @@
+/*
+您可以在这里输入任何 GTK+ 可识别的 CSS 规则。
+您可以点击上面的“暂停”按钮来暂时停用这个自定义 CSS。
+
+变更会立即应用到全局，影响整个应用程序。
+*/
+
+box{
+	background-color:rgba(34, 34, 35, 0.5);
+}
\ No newline at end of file
diff --git a/XeRelease_Gtkmm4/src/MyWin.cc b/XeRelease_Gtkmm4/src/MyWin.cc
index 9e911da..8c4d9ad 100644
--- a/XeRelease_Gtkmm4/src/MyWin.cc
+++ b/XeRelease_Gtkmm4/src/MyWin.cc
@@ -17,7 +17,8 @@ MyWin::MyWin()
     : btn_box(Gtk::Orientation::VERTICAL, 5),
       btn_ver("Xe-Ver"),
       cfg_box(Gtk::Orientation::VERTICAL, 5),
-      msg_dialog(*this)
+      msg_dialog(*this),
+      dark_mode(true)
 {
     // Initalize window
     set_icon_name("Xe-Release");
@@ -78,7 +79,11 @@ MyWin::MyWin()
 
     // Create Style for widgets
     provider = Gtk::CssProvider::create();
-    provider->load_from_resource("/org/gtk/daleclack/style.css");
+    if(dark_mode){
+        provider->load_from_resource("/org/gtk/daleclack/style_dark.css");
+    }else{
+        provider->load_from_resource("/org/gtk/daleclack/style.css");
+    }
     auto style1 = btn_box.get_style_context();
     style1->add_provider(provider, 1);
     auto style2 = prefs->get_style_context();
diff --git a/XeRelease_Gtkmm4/src/MyWin.hh b/XeRelease_Gtkmm4/src/MyWin.hh
index 95704d3..59c4870 100644
--- a/XeRelease_Gtkmm4/src/MyWin.hh
+++ b/XeRelease_Gtkmm4/src/MyWin.hh
@@ -29,6 +29,7 @@ private:
     void titlebar_init();
 
     // Css Style
+    bool dark_mode;
     Glib::RefPtr<Gtk::CssProvider> provider;
 
     // Config Page
diff --git a/XeRelease_Gtkmm4/src/os_detector.hh b/XeRelease_Gtkmm4/src/os_detector.hh
new file mode 100644
index 0000000..c687d78
--- /dev/null
+++ b/XeRelease_Gtkmm4/src/os_detector.hh
@@ -0,0 +1,19 @@
+// Defining the OS
+enum class OS_Type{
+    Linux,
+    macOS,
+    Windows
+};
+
+static inline OS_Type os_detector(){
+#if defined(__linux__) || defined(__linux) || defined(linux) || defined(__gnu_linux__)
+    // #define COMPILED_IN_LINUX
+    return OS_Type::Linux;
+#elif defined(__APPLE__) && defined(__MACH__)
+    // #define COMPILED_IN_MACOS
+    return OS_Type::macOS;
+#elif defined(_WIN32) || defined(_WIN64)
+    // #define COMPILED_IN_WINDOWS
+    return OS_Type::Windows;
+#endif
+}
\ No newline at end of file