created a toggleDarkMode function and implemented action for menu bar items dark and light

utilities/src/main/kotlin/notes/multi/utilities/NoteTextWindow.kt

@@ -44,6 +44,7 @@ class TextWindow(): Application() {
 
     private var newname = true
     private var curfile = Note()
+    var isDarkMode = false
 
     private fun notesname() : MutableList<String> {
         val retlist = mutableListOf<String>()
@@ -256,6 +257,8 @@ class TextWindow(): Application() {
             }
         }
 
+
+
         filemenu.items.addAll(open, save, delete)
         modechange.items.addAll(dark, light)
         menubar.menus.addAll(filemenu, modechange)
@@ -265,6 +268,18 @@ class TextWindow(): Application() {
 
         stage.scene = Scene(box, 300.0, 300.0)
 
+        dark.setOnAction {
+            if (!isDarkMode) {
+                toggleDarkMode(stage.scene, isDarkMode)
+            }
+        }
+
+        light.setOnAction {
+            if (isDarkMode) {
+                toggleDarkMode(stage.scene, isDarkMode)
+            }
+        }
+
         /**
          * Logic for key presses:
          * - Save: Ctrl + S

utilities/src/main/kotlin/notes/multi/utilities/Themes.kt

+package notes.multi.utilities
+
+import javafx.application.Application
+import javafx.scene.Scene
+import javafx.stage.Stage
+import javafx.geometry.Pos
+import javafx.scene.control.Button
+import javafx.scene.control.Label
+import javafx.scene.layout.StackPane
+import javafx.scene.layout.VBox
+import javafx.scene.paint.Color
+import javafx.scene.text.Font
+import javax.swing.text.html.StyleSheet
+
+fun toggleDarkMode(scene: Scene, isDarkMode: Boolean) {
+    //val darktheme: StyleSheet = StyleSheet(false, "notes/multi/utilities/darktheme.css")
+
+    if (isDarkMode) {
+        //note.text.toString(). = Color.WHITE
+        scene.root.style = "-fx-background-color: ${Color.BLACK.toString().replace("0x", "#")}; -fx-text-fill: ${Color.WHITE.toString().replace("0x", "#")}"
+    } else {
+        //note.text = Color.BLACK
+        scene.root.style = "-fx-background-color: ${Color.WHITE.toString().replace("0x", "#")}; -fx-text-fill: ${Color.BLACK.toString().replace("0x", "#")}"
+    }
+    //isDarkMode = !isDarkMode
+}
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