diff --git a/Theme.qml b/Theme.qml
index 04b6033..dac97b5 100644
--- a/Theme.qml
+++ b/Theme.qml
@@ -22,13 +22,5 @@ Item {
 
     property int radius: 5
 
-    property bool darkTheme: false
-
-    Settings {
-        property alias darkTheme: item.darkTheme
-    }
-
-    function toggleTheme() {
-        darkTheme = !darkTheme;
-    }
+    property bool darkTheme: Application.styleHints.colorScheme === Qt.Dark
 }
diff --git a/gallery/Main.qml b/gallery/Main.qml
index 393ff70..a326ec4 100644
--- a/gallery/Main.qml
+++ b/gallery/Main.qml
@@ -25,12 +25,6 @@ AppWindow {
             Row {
                 spacing: 5
 
-                AppPrimaryButton {
-                    text: "Toggle theme"
-                    onClicked: {
-                        Theme.toggleTheme();
-                    }
-                }
                 AppSecondaryButton {
                     text: "Secondary"
                 }