diff --git a/website/o3dv/js/settings.js b/website/o3dv/js/settings.js
index 53b3fc9..4589f99 100644
--- a/website/o3dv/js/settings.js
+++ b/website/o3dv/js/settings.js
@@ -1,7 +1,6 @@
 OV.Theme = {
     Light : 1,
-    Dark : 2,
-    System : 3
+    Dark : 2
 };
 
 OV.Settings = class
@@ -26,17 +25,4 @@ OV.Settings = class
         cookieHandler.SetColorVal ('ov_default_color', this.defaultColor);
         cookieHandler.SetStringVal ('ov_theme_id', this.themeId);
     }
-
-    GetTheme ()
-    {
-        if (this.themeId === OV.Theme.System) {
-            if (window.matchMedia && window.matchMedia ('(prefers-color-scheme: dark)').matches) {
-                return OV.Theme.Dark;
-            } else {
-                return OV.Theme.Light;
-            }
-        } else {
-            return this.themeId;
-        }
-    }
 };
diff --git a/website/o3dv/js/settingssidebarpanel.js b/website/o3dv/js/settingssidebarpanel.js
index ab8bdaf..afd51ea 100644
--- a/website/o3dv/js/settingssidebarpanel.js
+++ b/website/o3dv/js/settingssidebarpanel.js
@@ -143,7 +143,6 @@ OV.SettingsSidebarPanel = class extends OV.SidebarPanel
         };
         result.buttons.push (AddRadioButton (buttonsDiv, OV.Theme.Light, 'Light', onChange));
         result.buttons.push (AddRadioButton (buttonsDiv, OV.Theme.Dark, 'Dark', onChange));
-        result.buttons.push (AddRadioButton (buttonsDiv, OV.Theme.System, 'System', onChange));
         Select (result.buttons, defaultValue);
         return result;
 
diff --git a/website/o3dv/js/website.js b/website/o3dv/js/website.js
index 6778e5f..1fa10ac 100644
--- a/website/o3dv/js/website.js
+++ b/website/o3dv/js/website.js
@@ -279,15 +279,13 @@ OV.Website = class
     SwitchTheme (newThemeId, resetColors)
     {
         this.settings.themeId = newThemeId;
-        let calculatedTheme = this.settings.GetTheme ();
-
-        this.themeHandler.SwitchTheme (calculatedTheme);
+        this.themeHandler.SwitchTheme (this.settings.themeId);
         this.settings.SaveToCookies (this.cookieHandler);
         if (resetColors) {
-            if (calculatedTheme === OV.Theme.Light) {
+            if (this.settings.themeId === OV.Theme.Light) {
                 this.settings.backgroundColor = new OV.Color (255, 255, 255);
                 this.settings.defaultColor = new OV.Color (200, 200, 200);
-            } else if (calculatedTheme === OV.Theme.Dark) {
+            } else if (this.settings.themeId === OV.Theme.Dark) {
                 this.settings.backgroundColor = new OV.Color (42, 43, 46);
                 this.settings.defaultColor = new OV.Color (200, 200, 200);
             } else {