make the scroll a custom class

ks_includes/widgets/scroll.py

@@ -0,0 +1,20 @@
+import gi
+
+gi.require_version("Gtk", "3.0")
+from gi.repository import Gtk, Gdk
+
+
+class CustomScrolledWindow(Gtk.ScrolledWindow):
+    def __init__(self, steppers=False, **kwargs):
+        args = {
+            "hexpand": True,
+            "vexpand": True,
+            "overlay_scrolling": False
+        }
+        args.update(kwargs)
+        super().__init__(**args)
+        self.add_events(Gdk.EventMask.BUTTON_PRESS_MASK |
+                        Gdk.EventMask.TOUCH_MASK |
+                        Gdk.EventMask.BUTTON_RELEASE_MASK)
+        if steppers:
+            self.get_vscrollbar().get_style_context().add_class("with-steppers")