diff --git a/AppApi.cs b/AppApi.cs
index ae676c02..2dc14060 100644
--- a/AppApi.cs
+++ b/AppApi.cs
@@ -415,6 +415,11 @@ namespace VRCX
             return System.Globalization.CultureInfo.CurrentCulture.ToString();
         }
 
+        public void ChangeTheme(int value)
+        {
+            WinformThemer.SetGlobalTheme(value);
+        }
+
         public void SetStartup(bool enabled)
         {
             try
diff --git a/MainForm.cs b/MainForm.cs
index 595e701b..19b1a47c 100644
--- a/MainForm.cs
+++ b/MainForm.cs
@@ -13,7 +13,7 @@ using CefSharp.WinForms;
 
 namespace VRCX
 {
-    public partial class MainForm : Form
+    public partial class MainForm : WinformBase
     {
         public static MainForm Instance;
         public ChromiumWebBrowser Browser;
diff --git a/VRCX.csproj b/VRCX.csproj
index a9af5232..5cde8085 100644
--- a/VRCX.csproj
+++ b/VRCX.csproj
@@ -1,4 +1,4 @@
-<?xml version="1.0" encoding="utf-8"?>
+<?xml version="1.0" encoding="utf-8"?>
 <Project ToolsVersion="15.0" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
   <Import Project="$(MSBuildExtensionsPath)\$(MSBuildToolsVersion)\Microsoft.Common.props" Condition="Exists('$(MSBuildExtensionsPath)\$(MSBuildToolsVersion)\Microsoft.Common.props')" />
   <PropertyGroup>
@@ -119,6 +119,10 @@
     <Compile Include="VRCXStorage.cs" />
     <Compile Include="JsonSerializer.cs" />
     <Compile Include="WinApi.cs" />
+    <Compile Include="WinformBase.cs">
+      <SubType>Form</SubType>
+    </Compile>
+    <Compile Include="WinformThemer.cs" />
     <EmbeddedResource Include="VRForm.resx">
       <DependentUpon>VRForm.cs</DependentUpon>
     </EmbeddedResource>
diff --git a/VRForm.cs b/VRForm.cs
index a8fbda98..9e543640 100644
--- a/VRForm.cs
+++ b/VRForm.cs
@@ -10,7 +10,7 @@ using CefSharp.WinForms;
 
 namespace VRCX
 {
-    public partial class VRForm : Form
+    public partial class VRForm : WinformBase
     {
         public static VRForm Instance;
         private ChromiumWebBrowser _browser1;
diff --git a/WinformBase.cs b/WinformBase.cs
new file mode 100644
index 00000000..4865e5b1
--- /dev/null
+++ b/WinformBase.cs
@@ -0,0 +1,19 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Runtime.InteropServices;
+using System.Text;
+using System.Threading.Tasks;
+using System.Windows.Forms;
+
+namespace VRCX
+{
+    public class WinformBase : Form
+    {
+        protected override void OnHandleCreated(EventArgs e)
+        {
+            WinformThemer.SetThemeToGlobal(this);
+            base.OnHandleCreated(e);
+        }
+    }
+}
diff --git a/WinformThemer.cs b/WinformThemer.cs
new file mode 100644
index 00000000..057908d7
--- /dev/null
+++ b/WinformThemer.cs
@@ -0,0 +1,110 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Runtime.InteropServices;
+using System.Text;
+using System.Threading.Tasks;
+using System.Windows.Forms;
+
+namespace VRCX
+{
+    //Based off DWMWA_USE_IMMERSIVE_DARK_MODE, documentation: https://docs.microsoft.com/en-us/windows/win32/api/dwmapi/ne-dwmapi-dwmwindowattribute
+    //dwAttribute was 19 before Windows 20H1, 20 after Windows 20H1
+
+    internal static class WinformThemer
+    {
+        /// <summary>
+        /// Private holder of current theme
+        /// </summary>
+        private static int currentTheme = 0;
+
+        /// <summary>
+        /// Sets the global theme of the app
+        /// Light = 0
+        /// Dark = 1
+        /// </summary>
+        public static void SetGlobalTheme(int theme)
+        {
+            currentTheme = theme;
+
+            //Make a seperate list for all current forms (causes issues otherwise)
+            List<Form> forms = new List<Form>();
+            foreach(Form form in Application.OpenForms)
+            {
+                forms.Add(form);
+            }
+
+            SetThemeToGlobal(forms);
+        }
+
+        /// <summary>
+        /// Gets the global theme of the app
+        /// Light = 0
+        /// Dark = 1
+        /// </summary>
+        public static int GetGlobalTheme() => currentTheme;
+
+        /// <summary>
+        /// Set given form to the current global theme
+        /// </summary>
+        /// <param name="form"></param>
+        public static void SetThemeToGlobal(Form form)
+        {
+            SetThemeToGlobal(new List<Form>() { form });
+        }
+
+        /// <summary>
+        /// Set a list of given forms to the current global theme
+        /// </summary>
+        /// <param name="forms"></param>
+        public static void SetThemeToGlobal(List<Form> forms)
+        {
+            //For each form, set the theme, then move focus onto it to force refresh
+            foreach(Form form in forms)
+            {
+                //Set the theme of the window
+                SetThemeToGlobal(form.Handle);
+
+                //Change opacity to foce full redraw
+                form.Opacity = 0.99999;
+                form.Opacity = 1;
+            }
+        }
+
+        private static void SetThemeToGlobal(IntPtr handle)
+        {
+            if (GetTheme(handle) != currentTheme)
+            {
+                if (PInvoke.DwmSetWindowAttribute(handle, 19, new[] { currentTheme }, 4) != 0)
+                    PInvoke.DwmSetWindowAttribute(handle, 20, new[] { currentTheme }, 4);
+            }
+        }
+
+        private static int GetTheme(IntPtr handle)
+        {
+            //Allocate needed memory
+            IntPtr curThemePtr = Marshal.AllocHGlobal(4);
+
+            //See what window state it currently is
+            if (PInvoke.DwmGetWindowAttribute(handle, 19, curThemePtr, 4) != 0)
+                PInvoke.DwmGetWindowAttribute(handle, 20, curThemePtr, 4);
+
+            //Read current theme (light = 0, dark = 1)
+            int theme = Marshal.ReadInt32(curThemePtr);
+
+            //Free previously allocated
+            Marshal.FreeHGlobal(curThemePtr);
+
+            return theme;
+        }
+
+        internal static class PInvoke
+        {
+            [DllImport("DwmApi")]
+            internal static extern int DwmSetWindowAttribute(IntPtr hwnd, int dwAttribute, int[] pvAttribute, int cbAttribute);
+
+            [DllImport("DwmApi")]
+            internal static extern int DwmGetWindowAttribute(IntPtr hwnd, int dwAttribute, IntPtr pvAttribute, int cbAttribute);
+        }
+    }
+}
diff --git a/html/src/app.js b/html/src/app.js
index b89e03d4..41978a7e 100644
--- a/html/src/app.js
+++ b/html/src/app.js
@@ -11397,8 +11397,18 @@ speechSynthesis.getVoices();
     $app.watch.isDarkMode = function () {
         configRepository.setBool('isDarkMode', this.isDarkMode);
         $appDarkStyle.disabled = this.isDarkMode === false;
+        if (this.isDarkMode) {
+            AppApi.ChangeTheme(1);
+        } else {
+            AppApi.ChangeTheme(0);
+        }
         this.updateVRConfigVars();
     };
+    if ($app.data.isDarkMode) {
+        AppApi.ChangeTheme(1);
+    } else {
+        AppApi.ChangeTheme(0);
+    }
     window
         .matchMedia('(prefers-color-scheme: dark)')
         .addEventListener('change', (e) => {