Fix Dark Mode setPitch preview Bg and Grid Button Visibility Bug (#4398)

* dark mode bug set pitch preview changes

* grid option disappears when click expand btn

* changes

Author: Aman1919

css/themes.css

@@ -95,5 +95,15 @@
     color: #fff;
   }
 
+  .dark #chooseKeyDiv {
+    background: #333;
+  }
+  
+.dark #movable {
+  background: #333;
+  color: white;
+}
+
+
 
 /* Your Custom Theme can go here if you don't want to modify the existing dark mode */

js/turtles.js

@@ -994,7 +994,6 @@ Turtles.TurtlesView = class {
                 }
                 this._expandButton.style.visibility = "visible";
                 this._collapseButton.style.visibility = "hidden";
-                this.gridButton.style.visibility = "hidden";
                 this.activity.helpfulWheelItems.forEach(ele => {
                     if (ele.label === "Expand") {
                         ele.display = true;